Malicious PDF — malware analysis report

Static analysis result for SHA-256 b170113387aa2e7c…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 00:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e1b03dc6429040b10f05e47c3c1883bb SHA-1: c1e9cffbde17fbb0a0fd9c1531ee132cc1839192 SHA-256: b170113387aa2e7c3650f65d59f1a8f19e6fbf7b3e16c2fe7b7b6b19185be84a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised or disposable domains. The presence of a high-severity heuristic for PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS, along with ClamAV detection, strongly indicates malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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.
  • 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://madmojo.com/fckupload/file/25676030674.pdf In PDF document text
    • http://wedding-box100.com/uploads/files/202109150228529933.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346c4c36e75---vemofunomogikixifap.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109091234265880.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/vareruxudojumazeko.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/nejamukapepil.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/25318004335.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/30162499865.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/196db64a9f4dbdcc395c8a3612f08832/disurilewivalo.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/90452793089.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/20795195384.pdfIn PDF document text
    • https://2winit.com/Files/files/ritumitarugag.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2aa3df93d36b545efb616f03444a3e4f/kaferirarovil.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f115acfbdf---lefasapozexixewevimim.pdfIn PDF document text
    • http://www.puhito.hu/uploads/81727844626.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/kefiniromasimogavazurix.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/70535389349.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/larubegolejalemuna.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/bejiziwupigovilini.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/wupevegisurateresiminazi.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/78495308599.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/37476885602.pdfIn PDF document text
    • https://clickbox.ro/images/file/66349779522.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/lufinosizox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=android+studio+full+course+pdfPDF 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_off0000d5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 17440 bytes
SHA-256: 4d07f3a58452b876b6035f7cab7b235b97f45a06ca733532355827377b454203
font_02_sfnt_off00011a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A91 10532 bytes
SHA-256: a506c4d5c4a08a4f5b2e27435c15256ffadab8848de5dcee7f89783592f7d303

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