Malicious PDF — malware analysis report

Static analysis result for SHA-256 41860c1ef6eb8ecb…

MALICIOUS

PDF

90.1 KB Created: 2021-07-15 14:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e634aec11a3187ed85d4d6c8153e7373 SHA-1: 3610463ee6c5de224b13577a91ba31ee402fb23b SHA-256: 41860c1ef6eb8ecb3961d5f13ef5370a3b7979a4192e6266ae084fb291df164b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the nature of the links and the PDF structure point towards exploitation for client execution, potentially involving embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://blissworldbeauty.com/newerac2c/userfiles/file/pudekizilafemamo.pdf
    • http://cipetbhopal.com/webimg/files/51527387605.pdf
    • http://kokocurry.gm/userfiles/file/35805229728.pdf
    • http://anhbanglaw.com/userfiles/file/tajoxajezituxeruwi.pdf
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/wazawirosigex.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d54bb9e64---31349927147.pdf
    • https://chiuman-hk.com/images/file/12078903237.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609327f09d42e---kusarifuve.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086824bf1cbb---87506934593.pdf
    • http://evohome.pl/userfiles/file/23724442317.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/8c5347ef4f85d752375e25c36337f849/73309835710.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c19f06daa1---nukofasetigapinawenug.pdf
    • http://lt101shop.com/userfiles/files/zewixan.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/d2vc9b1l7ins4c7kvpjtbjjvl1/xogakaxawobaten.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c75218c3aa---wanifev.pdf
    • http://boxshop.mn/userfiles/files/kuwagivepinumafa.pdf
    • http://salwex.hu/file/13155109461.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c59892571cc---sidimabojofetisevabor.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/363kaaokft9olvag6ecd0srjls/70398200041.pdf
    • http://fsoa.cn/userfiles/file/39982076498.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/htpa1qliu8nmeq3famom1697r2/sigeponexawi.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b790b340976---desisekubuxofon.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e69ad5bff---kopojajepekuwoti.pdf
    • http://ssaisarang.com/ckfinder/userfiles/files/83399419266.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/jiralu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=blessed+be+the+name+of+the+lord+blessed+be+the+name+of+the+lord+most+high+lyrics
    • 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_off0000fafb.bin
532cc576d7a660a342e14161efc9fe454c3fd593f7282ad1531914fce81c7fce
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFB 16824 bytes
font_01_sfnt_off000125f9.bin
46f0cd3ae0ba20e29876b67501b48c9f1c534a02632aa4e179e201cba80dd085
pdf-font-stream PDF embedded font (sfnt) at offset 0x125F9 11232 bytes
font_02_sfnt_off00013fee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEE 16792 bytes