Malicious PDF — malware analysis report

Static analysis result for SHA-256 731879009c85f895…

MALICIOUS

PDF

87.7 KB Created: 2021-07-03 13:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5502487071148f1640d35a5f9141775d SHA-1: c688787fa72c1e0157cf937844bab17549c080d0 SHA-256: 731879009c85f89506ca2abd0852aa91ca65aa167d1556342cb739f639cefdf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://archism.ru/uplcv?utm_term=gta+san+andreas+ppsspp+android+game+free+download
    • http://alphasigmaoverseas.com/userfiles/file/95814930412.pdf
    • http://greenbrier101.com/userimages/lozetapazopiwuv.pdf
    • http://staractivecollection.com/resimler/site/files/80728769843.pdf
    • https://accuratesearch.com/userfiles/file/8479391566.pdf
    • https://sheenabusesandcoaches.com/userfiles/file/zonefusamudejikipi.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/54741a9f6c033d147db89362788f900f/51732208004.pdf
    • http://maxbrio.kr/files/files/lixituxibotokaduxakopovi.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c21dd40ea---kigiwiwojigakixomopu.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cff0d876d95262280c94daf47b1f6630/23206175014.pdf
    • http://deccanquest.com/konadnew/userfiles/file/buladuduxolegik.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/4096540330a823ab1c69deed5f0bb151/zaravakared.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/fj9pbt1ashb9gc92gvc3qcnuq2/peganef.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d040b851492---27429750901.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c659d7fb92---41157526537.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c874e2bd2dc---nedekatanizo.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074a0bb6c70d---nexopojepovupid.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/kgnb1dspke4f5k85hn3q240s07/26630326261.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/b13707a68d3cefb8403bee27a7b7cd20/notarapiwigekudumuwabo.pdf
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24496889396.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607580271368c---68466375642.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c77014f1e20---87036066661.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7965117b---15167015631.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa99c2898---81564327964.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/46128236088.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b734424eabb---39402954997.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607371e81ac1c---tosikalaliregegajevitukep.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_off0000f3e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 16792 bytes
font_01_sfnt_off00010bf4.bin
4269196ea4cba9ecffe7c321159b47db5e9632c0e1c3bb6489ca186d26dccf01
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF4 16748 bytes
font_02_sfnt_off00013777.bin
b36c58a5a6c1e792e89a178bcd08d54f8a8cd32c9f891891b86c500da48c39f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13777 10968 bytes