Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff24a026a3b8725…

MALICIOUS

PDF

90.8 KB Created: 2021-06-29 00:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ff658469d75686e716eca198be141bc SHA-1: 773b986ed2515657b488e9a2272c5ee4f2f5d8fe SHA-256: dff24a026a3b8725601fc9128af5d83a359c2db750c6850d29463f9c7db6e006
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/9cd27dffee853eeacfdb1cd203fd0979/gugorasezalapusesumax.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/3591bd9309d242d11b22eaff22c8d25c/jinawovaw.pdf
    • http://learnersdigest.org/userfiles/file/gapobaw.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff21f403ef---wugunakorezutasozavotud.pdf
    • https://new-baby.me/userfiles/file/molinezetuzezixebesozok.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/mehq9qu7i7v09jvesqptgte392/31305689314.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4kfqrf2plkp5ipsnh38ldqo1q5/jazeniferefane.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/1uqike84ru62rdie02emof5jdr/xonanajesomowapil.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/6gbgi5ba9am3d5mar3a1rfe9o2/74557493005.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077d9f6a34bd---maxivabuvit.pdf
    • http://funperm.ru/content/file/5204860541.pdf
    • https://angkorphotographyguide.com/userfiles/file/65092564339.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-6-27/20210627073126906985.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05df613976---vitewuxozefodo.pdf
    • https://bdcomunicazione.it/file/puxikaxodipubafudovixe.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/98786602912.pdf
    • http://domusanna.it/userfiles/files/senupi.pdf
    • http://mispuntossaga.com/campannas/file/bomolimofatumajegusodelij.pdf
    • https://atcotourismtravel.com/userfiles/file/butumo.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d866416837---minumonazu.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/92ed7a951400e493998d567451d893d1/pawaxogosenowubef.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=sweet+betsy+from+pike+burl+ives
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e989.bin
05494428998806b72acabb081a3018715ddcbfdc194f8ac5c623edb46083bd5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 17704 bytes
font_01_sfnt_off000117a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117A7 16792 bytes
font_02_sfnt_off00012fb8.bin
11c5a07d087146020572b41e3c25cf6f3fd7b709257038c787216a38c3b0495f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB8 16228 bytes
font_03_sfnt_off000145a0.bin
cc279086fd1efaa36a2813f1995c0d737319a575041810f2f36bebb480ed25dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x145A0 10924 bytes