Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a2041591aebf52…

MALICIOUS

PDF

92.1 KB Created: 2021-06-07 03:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: aaca4ea43f53a7ff826419f61d3eb44e SHA-1: e67ca16619ca68830b20c186e284d5dbde84c0de SHA-256: f8a2041591aebf52b5aae3db80abed99453ff71a71c0929e02be2b86ba713297
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely contributes to the malicious functionality by facilitating redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://crewmak.ru/uplcv?utm_term=what+does+benjamin+always+say+in+animal+farm PDF link annotation
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/ba3e32477614fdd47aa9eeb8a58cce4b/83676906022.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2633d23a9---teret.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c2d9f3e77---serosofavunupuj.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ieldvh9ja5ejlsnao5vbe5oin0/xalifa.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/43798538482.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f1b2731b5a4f1f017587d969e5c01528/51458240014.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/dupulafowamomokulisodamim.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/812ec074f7b508f5b253b58fc57c5b42/zawipigalamitini.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098674c2b491---96615462905.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098258a67776---walonexog.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/92ffb8fb72e165edf0e117cfa748267c/19264177539.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/f4cfa49415fe933be23a1e9ba4329414/vobawukomogipawiwoxegan.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7dc78da3d---zeririwevul.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/72545814578.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/64266561419.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/damotanowanovutixoxivim.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file/%5C/2021060318372063.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/3578437372c46ba6f5fd61041975f4e2/72376277821.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/0c769e69d5184a4f7f39877cea30de6a/wazisemixitewuliliwifita.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070afc640b0b---rubakixoderavokuxika.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA8 5572 bytes
SHA-256: f8823718f9d86d8847f637929c0ab999503e4c51e3907be555b026a7f4887fb3
font_01_sfnt_off00013d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8E 11048 bytes
SHA-256: 30a0349a080b1e746247ef6be2fa6359107a53e34c6a3258ad9d2b09345263c2

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