Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c890864643359f4…

MALICIOUS

PDF

86.1 KB Created: 2021-09-01 18:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 528f33fa750ac59ad28c574c0cd60cb4 SHA-1: 5d32c423eb265f74093cd0f52719a00dc922dc11 SHA-256: 2c890864643359f438268f96b29b5e8e17d290a6c1c452eea518121cd7f2e4fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://huntic.ru/uplcv?utm_term=oxford+class+3+science+book
    • http://anhuishangbiao.com/upload_fck/file/2021-8-14/20210814014408719963.pdf
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/93672205987.pdf
    • http://extintoresorigen.com/images/editor/xaforarat.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9de60c6e24---67095625823.pdf
    • http://akkoryazilim.com/userfiles/file/xifamakowuvufu.pdf
    • http://strahovka66.ru/userfiles/file/kexatavepikutil.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840d35ac687---61344188100.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805bbd5e166---36191950469.pdf
    • http://myarrahnu.com/mo_images/files/kidomepadipulumori.pdf
    • http://burchiellati.com/file_fck/file/18735466980.pdf
    • https://lifetides.ca/cambridge/uploads/files/muvegobitonejinepo.pdf
    • http://oicenglish.com/imagexx/files/bosijesevogukinosew.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85b16884e---31754570600.pdf
    • https://louvre.lv/res/wysiwyg/file/93323192253.pdf
    • http://j-line.ca/fck_upload/file/97126822704.pdf
    • http://nsfeed.com/_UploadFile/Images/file/gozatepev.pdf
    • http://veno2.com/upload/jufelalerawuxefexif.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087742704fe8---4177958669.pdf
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/getubem.pdf
    • https://nhorizontours.com/userfiles/files/24320487849.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d96c3b10a9---lewopofekeximit.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ffbb0782af4b3726cff2dedfbbd1785c/javirokuditikuwuvuwugoxep.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df98.bin
4271edffa11e9d96a99beea06a4835849cc3f23fb99b0788b5743c0a8b58854a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 21748 bytes
font_01_sfnt_off000117f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117F1 16792 bytes
font_02_sfnt_off00013008.bin
c0f7493d231de1bc17fd5420cff2aba409479d959efe2fb064b8f041bcde529b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13008 10904 bytes

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