Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c10c16bbb52d46b…

MALICIOUS

PDF

87.3 KB Created: 2021-06-26 13:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3478bf6ae8f1a239b9dac7a2e8136d03 SHA-1: d0e1d830f3830a7c97c42c8cd48ddd6aed1f812f SHA-256: 8c10c16bbb52d46b733d2460e623cad5553913d1489f16df4650dc5a7a7d069c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the link farm nature is a clear indicator 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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1317a1c2b2---vosapazemulugole.pdf
    • http://shqinze.net/admin/upimg/file///27931893705.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072842697b46---37461920468.pdf
    • https://zapcdn.space/web/img/podborky/files/wexuzepitojozidexawewok.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4182605d5---85426803151.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/2eb20618974294a35e4778ed624616fa/gakoviran.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a188a1a3312---mulenisutozezum.pdf
    • http://rajskiewakacje.pl/userfiles/file/3662585674.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/44bjap2fjout27ui6r8pv0ln30/butubaxu.pdf
    • http://atol-res.pl/uploads/file/90072229972.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bcf12dc5c---xegokatunigofifisogiw.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f7db8aa2a---37792404409.pdf
    • http://shuimotongyuan.com/userfiles/file/27448853238.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e040a03c2c---7412697447.pdf
    • https://varbackaforskola.se/ckfinder/userfiles/files/xerixatamu.pdf
    • http://candybeauty.vn/upload/files/7247064701.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5d72c4042---kevowajujibuluxunun.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16086a8f40093b---xifopexanegewufolegid.pdf
    • http://sake2metustin.com/uploads/files/81097067247.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/a9re54vu9i8n4tpv834a05h0hr/witeruragelubaje.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/8fd36d33ab6d9b680d18c69f82cf358e/ruloxixetiruniviwekud.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/9bcf17ca320e372be106ece6ebeacd22/feligasusopunekugurari.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/61d04e3f8b76d30ad81f43ab6d319233/rasozajuboj.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/50d4c7ca45b2ea85198b9f957970c9dd/tikebenisibunagifebonimuk.pdf
    • https://a2designbg.com/userfiles/file/nuvuwiragifobuzepaxesu.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2a92847013dded99be182d03144ff145/7068061021.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=siobhan+kelly+barrister
    • 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_off0000f285.bin
59ef03a920032a1e5dbe0ccd6bb1d06a3496d5a6518ff25b545742dba161fcce
pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 16804 bytes
font_01_sfnt_off00011e02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E02 16792 bytes
font_02_sfnt_off00013619.bin
d24a54c3e0b9c114a17a5b44f5a2355252a0b10b2b937edd3dec608f7a589f61
pdf-font-stream PDF embedded font (sfnt) at offset 0x13619 10628 bytes