Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d3cb1fa08df4c0…

MALICIOUS

PDF

99.5 KB Created: 2021-06-30 19:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c32bb100aa5812b1159420d9fe8959a SHA-1: 3e5dc8c66e41b2a3454256f09d01b7a90cf932bb SHA-256: 16d3cb1fa08df4c056cc9db16813021f43180f1537659eda636928d39f751218
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://mispuntossaga.com/campannas/file/bomolimofatumajegusodelij.pdf
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/lesulajurejowumipaf.pdf
    • https://etimes.mn/uploads/files/228482765.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff9b6623b---4629832626.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/61f7b5d6695e2ed953d08604426ab28f/xemab.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/942f447bc23b69af3ff462a5c8c97b7e/widudovizoxezekedepinir.pdf
    • https://bawwabatrizq.com/userfiles/file/rokeladeru.pdf
    • http://myucmas.com/userfiles/file/zenanuliguwepoxilasedivo.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/5868b638a6f009f929ace2a555dfbaec/1060972800.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c10eaf016e6---15842622767.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aa7dea06d---52239570075.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d2621af65---23871725718.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bcdd583a7---kukovuwemogaze.pdf
    • https://schmitz.cz/res/file/sazaguxumid.pdf
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/71597619623.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e0b7019e2---vimegojot.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/9bb44f98a06effe8ee4b59f62236061d/xetigatekagufupixadif.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160801959afac3---tidowopodalolosiguwuw.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0edffd6977---posaridaf.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f519205a6e---84726695712.pdf
    • https://swift-tw.com/lcc/upload/files/39892933799.pdf
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/82262250565.pdf
    • http://eko-inwest.eu/upload/file/soxowi.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089a99a95bc6---17677132753.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=words+beginning+with+short+e
    • 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_off00010882.bin
e130aed8c78368c673652f21a4a00cc2a44b2274add9fe114866d3265df337c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 18648 bytes
font_01_sfnt_off00013945.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13945 16792 bytes
font_02_sfnt_off0001515c.bin
0a4e1bde7c15b59398875e9c75c9bb6ac6890dde22cc7fc68f324b8521820658
pdf-font-stream PDF embedded font (sfnt) at offset 0x1515C 10536 bytes
font_03_sfnt_off00016921.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x16921 16164 bytes