Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8b621152591bcd…

MALICIOUS

PDF

80.8 KB Created: 2021-09-01 03:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a3765db5da305584b8d6ec1114ea183f SHA-1: 3bb4f493b8ca4b4dcc976552b36e5e98ddcf6fdc SHA-256: be8b621152591bcdab8956865006b1c749ccb93ebf5eef8c1f14ce871521e703
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links to external PDFs hosted on compromised WordPress sites and other disposable domains, suggesting a link farm designed to distribute further malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using algorithmically generated URLs and link farms for malicious purposes. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • 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 http://budohurtsa.pl/userfiles/file/58767758153.pdf In PDF document text
    • https://boyanbolyarski.com/userfiles/file/sujopalulolonibudimas.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9cd5519b6---90436996069.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612df9a8398f6---damewumanositix.pdfIn PDF document text
    • http://df-2.de/images/daten/file/jotoxojegife.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///38472367633.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5a8a1948---xovudu.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/mogevetofutibikikid.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/22401381213.pdfIn PDF document text
    • http://ausafe.net/images/art/files/wovajuxurenurakolo.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/1219131175.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/61171769560.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ab8a0df8---zikukomubivisomasow.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7e06c1fdb---dabapolapikute.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210823_191929.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/fujexubepuxabo.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/685d82e9934446158527f580559fea71/78963383278.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/856fac59b2fba64fe0b6d85c0d99558c/putuwupexavejogogiwoke.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/35e5a80cc65f36eb89bdd99ccf5bafb9/rupejokewujijid.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/a05pduu61j73oain3u0f3p7mr2/jibotekokokitasub.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/marezaxaseb.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/30049827052.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ghkmrvsfn3sbclu1daj2a8iph3/44967781187.pdfIn PDF document text
    • http://lhsclassof77.com/clients/34792/File/64493328905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=an+introduction+to+management+science+12th+edition+solutions+manual+pdf+free+downloadPDF 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_off0000cf1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1C 18172 bytes
SHA-256: 2f5f7ac42477129f95c2e44ef581b965a9afe8bd39b79d63e6cf1820e4a785d8
font_01_sfnt_off0000fe71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11688 11404 bytes
SHA-256: 0d7d1c82c27f770fff8932e1021bfcbb5a0812f5e39e6975dd3aec53e0ecacf5

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