Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66daf122583ab6e…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 23:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bd07fe0c632a3b2e19817031b64474a0 SHA-1: 6716b107ec06bbfd8761c084c347207d83578a3e SHA-256: c66daf122583ab6ebfbef76f65d6fe514b912940e70f6777aeedbc4acff77fc4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be disposable or compromised hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to act as a link farm, likely to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=my+face+in+different+hairstyles+free PDF link annotation
    • http://yibetter.com/data/files/84274591954.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/51256524355.pdfIn PDF document text
    • http://canoeing.by/pics/files/10385173387.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/fejinubuf.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/1804058606.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/wexetaxug.pdfIn PDF document text
    • http://www.heksan.com.pl/file/zidufiwexisonerivokuwej.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/27489326634.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/nutepipoxerolowuvasal.pdfIn PDF document text
    • https://dm288.rs/slicice/file/foxexuxab.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/rapulafemowomiz.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab8e5e57e---51362239548.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/42442714781.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/javalisetasavuxose.pdfIn PDF document text
    • http://mweb.cz/images/file/67608611012.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/nevun.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/sesesipubarurofor.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/p7e557pq6mhks9vdi898as6385/kowalopobux.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/4759456172.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/fd4c7934a7bf55dd00aa3567d33abcea/35603224937.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/kozokisakupeja.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/dusagiridinox.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/1374725533.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/96957630115.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/vkiniknmqor6uf92mujrdqfg92/puzitugeramuwerox.pdfIn PDF document text
    • 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_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 17604 bytes
SHA-256: e3ff468b8fcaef7b37cb1014581dc795497a2aeaba8c9a51b9d3af97f44255b3
font_01_sfnt_off00010d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12518 10560 bytes
SHA-256: a051aeab222f87aa525893a32f9aafcf05c918059e8e96f6b21fdfaeadc323a7