Malicious PDF — malware analysis report

Static analysis result for SHA-256 7248260b4dbcd8f2…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 00:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2725bf903c16c4ccbb5a61cf0f80373d SHA-1: 7ac03e1dab5ff3616a249213f5fe441d07203b94 SHA-256: 7248260b4dbcd8f20fedb48aec38d54cc7c0dcbc31c3c47f89fcd97f50996426
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users into downloading further malware or visiting phishing pages. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a463b8b4ee5---bekejedigulibogumabepuzid.pdf In PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/zomesipufolowokunulutevub.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/s0crol5njqbrhhe9qi62gbjep1/pemoxazoxilajasewepef.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3fb3de704---70398079996.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/tekupomifix.pdfIn PDF document text
    • http://fnathservices.com/upload/file/91160357488.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/ba51915dfb7d7bc43e4799f9394fed7b/44024215596.pdfIn PDF document text
    • https://unaizahic.com/Files/files/lureloran.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160774fea86e15---62012813774.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/vamutivuzaf.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160738af50dbf6---31266216738.pdfIn PDF document text
    • http://huimao.com/upload/62289553088.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/kumukuzeresixubu.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610657106ecb6---6618632591.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/riwudenuduwi.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/e7930de393303028d6f5ebf8ba86810b/88197230203.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608afa8868ec8---27979162342.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d1eb3f5a---diluba.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a46abe7208---kogewofubudofa.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/41125543369.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ab69aa1627e4f12be39a04338ea9eb7c/39518056864.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e975506f9cc---nexafelize.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d77978fb4---numodenimetasezu.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210813084626.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cea821fafb---60703615875.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/50137533949.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/lewujusoxigomudumiwadugu.pdfIn PDF document text
    • http://ashioke.com/images/library/File/41773932262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pain+in+esophagus+after+endoscopyPDF 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_off0000e507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE507 11068 bytes
SHA-256: e96abe71273b4342f61e1ba3f7344741c4d3ea7a353cb41455cd1f38e3c52b38
font_01_sfnt_off0000fea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B2 16816 bytes
SHA-256: cf27693b2050db8b92118c487b8dd4599ec3d5ede9502d6110b968c23efbea58

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