Malicious PDF — malware analysis report

Static analysis result for SHA-256 9126e534fba2833e…

MALICIOUS

PDF

74.7 KB Created: 2021-09-05 04:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dae718657b804ed78acfd84adf7b6736 SHA-1: 7c3c5aea6d6674873c86e4aac43535ae0a018935 SHA-256: 9126e534fba2833e98c2560fc7335bfb177fb713892a779570d6d221d38ec98f
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains. The presence of a download button lure and the ML classifier's high confidence score indicate a malicious intent to redirect users to a second-stage payload. The ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://deltarents.com/upload/ckfinder/files/gukoku.pdf In PDF document text
    • http://christschoolblr.in/userfiles/file/wumajikafodolowituvuj.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/xadojozowokunudutudi.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/guxoselo.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/4517b560c934625113f2d6ebca46e76f/59652156518.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/62325588023.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/fed01e9b475e91dab045d094e5cb9df4/pejusolelapu.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/zajedilefupavatujepiwezo.pdfIn PDF document text
    • http://uchid.com/uploads/file/milugipevokutulopojatafaf.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/xibelopixutadexalawiwe.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/bemifanowapabudo.pdfIn PDF document text
    • https://stopserv.ru/files/file/mawagirase.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160926a830339c---dagevonaweluviredofofukis.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/cb3f9660c20f46cc6483a7be77e1ddae/99703401122.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/bf6df777cdf0e287fec8482a740fa465/65751637438.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/zavowedofikewexujarikawa.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/t6mum3j4iia0g7a6h8e670rq9t/fonekugexu.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a595eb7f85d---27642211036.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/j8lsqei92ku2aft8fq5g6r29t6/70859761824.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/mitekuronowavenonegusemo.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/wopeg.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/r334e1mqb2rd5oh6g614ritjq4/repavibaporukezizub.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/jakadoti.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607041f468368---kebutilonigomodona.pdfIn PDF document text
    • http://stpatricksreunion.org/clients/84553/File/73970959742.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a405e95694---varipomeleja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=compress+pdf+to+500kb+online+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF58 11016 bytes
SHA-256: 70ede04ea54a4772eeff01443a783c9c2778f3dd925f8e785712491e50f5f3ad
font_01_sfnt_off0000d8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 17372 bytes
SHA-256: 0f9276d85207b5339122ab7166d7dc3bb61c2b21c1201f5bc2e7d85c740e8806

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