Malicious PDF — malware analysis report

Static analysis result for SHA-256 4901be1bc8454f0f…

MALICIOUS

PDF

91.1 KB Created: 2021-08-24 23:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7cd4e3f81ba23b1570e3f7910a6db30d SHA-1: 059dc379d88c77240e4ad1a0a4a89de55387a896 SHA-256: 4901be1bc8454f0fa3cd265a441736e3dd09089d60ab542fa87e622c2dbfebf4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://spherule.org/wp-content/plugins/super-forms/uploads/php/files/2d984b6a54a64fcde90121ea0d74e95f/gopabelidowujerozedufuni.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nasozukavosan.pdf
    • http://pekingtogo.com/uploads/files/dikuge.pdf
    • http://clubmaniacr.com/campannas/file/redopovatazutigofafomojo.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/57064c25f1870df606a2c7c59f49715c/32883117362.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607880b822160---70003106346.pdf
    • http://volkshilfe-vlbg.at/images/content/files/61501222762.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/2f0d65423806ece2b40c83368b6455be/gimozinaxomaxiver.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/505r9ucseeheajiq9p54ujono3/bugopejufogevima.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/1664f30ff0b265576e99974cdeed9fac/24167612616.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b71013060e6---desajiretumudatusikof.pdf
    • http://burelomdo.com/ckfinder/userfiles/files/vuvulufanalu.pdf
    • http://humanitool.ru/userfiles/file/69463630126.pdf
    • https://collegemahan.ir/basefile/collegemahanir/files/xirigamo.pdf
    • http://lookkorea.net/userfiles/file/zupupotarimujariwolo.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/3o55tfhnbfte7bm0dtck5q6juh/33594837121.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/r4cbeaorfj7lnua496r0m7sast/rudagavexu.pdf
    • https://pt2-turbo-j3t.com/contents/files/dabukezeresejirisuseribat.pdf
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/katogopos.pdf
    • http://cy2hand.com/userfiles/68412059852.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/0df54968e84300ce73fd98041ef51b67/80600103792.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/71f852ef9ea04b210d06c21aff1cbd1d/putodovawuvuzasezolitodiw.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160835a20662d1---vabidanisikojuf.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pms+in+your+40s
    • 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_off0001076c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1076C 16792 bytes
font_01_sfnt_off00011f7e.bin
751810babc196085a99fc38e678e8d2d2f1e749d51e95ddc522ac284a709a97a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7E 15752 bytes
font_02_sfnt_off000147e5.bin
1dab605a57914c0450f833887deedbd456e88577388f29d75698d91ec1f74ed8
pdf-font-stream PDF embedded font (sfnt) at offset 0x147E5 10244 bytes