Malicious PDF — malware analysis report

Static analysis result for SHA-256 0acdf6cf81c33203…

MALICIOUS

PDF

78.4 KB Created: 2021-08-15 21:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 419c54d58d04db793e4633ec7d402be9 SHA-1: d4dbff49539a134b4d35ccef108475be64af0028 SHA-256: 0acdf6cf81c33203ef1626499af1ba3f6bc38ce35e433a9056267ae135ae11b7
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised CMS platforms or disposable domains, indicating a likely attempt to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://daquin-ferriere.fr/userfiles/file/mabob.pdf In PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/9981640804.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610d851661602---pujivalomukexile.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/7411232451.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/fawubilifilu.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/32dd3354661ee2fd80d05a7ea703eb65/bizelogojafelipelotib.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/levapuzudebiragu.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b43389595---73782007556.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/48402644624.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/33276866067.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/fed8eedc6e127de8dcf7569eb201f244/talasagafotadigaj.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/nadid.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/bujorilidigufogivibalovak.pdfIn PDF document text
    • http://scriptonica.ru/files/files/kimat.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/xovesozagigoge.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ddf755624---mofupotuz.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/vekokorurogegiwefikefo.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa207b45e68---47593255425.pdfIn PDF document text
    • https://irantruck.ir/data/file/15560958090.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021070414214273499.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/bf484d99e4154cfe0850a879ae605292/23931485924.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160be7d1fab4fb---wesugukozabonabir.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/gukofusebiretux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+i+lookup+a+phone+number+for+freePDF 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_off0000cd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD76 10904 bytes
SHA-256: 03d13a6c711171d9187694c5dd587b04e6cdab5b24eeb7477c19ab5d78ebd42d
font_01_sfnt_off0000e634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 16404 bytes
SHA-256: aa8306b96e511d38d57f59079ff0b0c1ab24203940af3977dd76bff4e9f283f3