Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7261bec0f4af971…

MALICIOUS

PDF

85.5 KB Created: 2021-07-05 05:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 487ac05f14fd40f9aa2ecfdfd9063f6f SHA-1: 464186891d4a8cdffd43c329f6aec258621bfd74 SHA-256: a7261bec0f4af971bd581bf3db8697cb055c5214a3708b43bf3a8b16af9458de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised or disposable domains, which is characteristic of a link farm used to distribute phishing content or malware. The presence of these links suggests an attempt to lure users to malicious sites, aligning with spearphishing or malicious link attack patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 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://cateringkieuan.com/uploads/userfiles/file/82769767172.pdf In PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/n9mbtirmsag63obcc51rodjbrd/45128217170.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ere6h4ip6sjiv5ai2ugmq2gvf6/namuzofijodolomimilulegib.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e103cb61397---6458742080.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/59463808789.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/88l3v5hsdjbecff9k86rgjhcg6/ribufebopitiv.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/bitilisadezi.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/17fa50e0653b9130be3b3e963b7da2d8/35563727689.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b70f54175cf---bikigovetomufuxigaxakar.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ib7tem9u2p4qgcm8l2253ki0u4/40088832502.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/88150192262.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca785bd764---vakevokuwisino.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021061114513273499.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/36926913552.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/44989788233.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c729c7a1bac---93725168966.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/4841834142.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/a54aea1bf7252a8f001724fba9d3da83/49517821557.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/42488ad799149103e13b5439719d6d76/51010002112.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/24e0756415dd1c1ef5c84620f66a7c87/zotelujobevevaforavezaxin.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/57125286208.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/81518963517.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/zusufajesedirakumoxugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=present+and+past+tenses+exercisesPDF 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_off0000eb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 16892 bytes
SHA-256: 935007ceeb6311b73a2b79ebd31719f27cd1ff8cd73d0a40139e4f0290675595
font_01_sfnt_off00011744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11744 10444 bytes
SHA-256: b4aa3c71c09425e162a1a8a3f6d1c13fac891726872bd79a1f7a45eec92c4089
font_02_sfnt_off00012f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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