Malicious PDF — malware analysis report

Static analysis result for SHA-256 2587638aeab7198b…

MALICIOUS

PDF

106.3 KB Created: 2021-06-27 15:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22fdd30ceef0ebb3cfa729ee32fbc5a8 SHA-1: 63143885540186a4716f95768ad407c309924023 SHA-256: 2587638aeab7198b5166a1cd4451d0cd3fcda7320e881329c8c8032a124f831f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a phishing or redirection campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, but the PDF structure itself is used to host a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/8f00b2b1bd8c3df7e575bdb02921afb7/lepifoxexaxikozi.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/57907895653.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160858399e2b1b---48981145971.pdf
    • http://komputerzagrosze.pl/userfiles/file/gosezuge.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a176169a52c---fezikebipujufuf.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d397b98e9a---mujapokefekudizusod.pdf
    • https://thietbivesinhanhhuy.com/asset/files/mexonoterela.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/omkfuauaon9as27bm4fqn0jop1/27952176976.pdf
    • https://lamthong-marchph.com/piceditor/file/47726032463.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e4a19b598---40386541007.pdf
    • http://maychamsocda.vn/images/userfiles/file/80334141898.pdf
    • http://asbufestival.com/uploads/FCK_files/file/xevalunabixefol.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/e07298c3f70ec3908a2d9b44f4c1124c/79862970232.pdf
    • http://uniquecharacters.com/upload/files/87255525187.pdf
    • http://ztkammer.at/uploads/file/lewiko.pdf
    • https://mangmalungtea.com/userfiles/file/gefevofigexa.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ec46824ad---87978940845.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/defdea5b9ed9b3e276b47a5c86f2c037/xopewanudagolavej.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/sadofigejobububija.pdf
    • http://kursadowicz.pl/Upload/file/97737777269.pdf
    • http://przedszkolenisko.pl/userfiles/file/maritidijera.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dehydrated+after+drinking+water
    • 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_off00013c6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6B 16792 bytes
font_01_sfnt_off0001547d.bin
1d1371d45d7f1516abd4224ff3ea4a3708e1e8f5773b2640275828a445c44684
pdf-font-stream PDF embedded font (sfnt) at offset 0x1547D 17572 bytes
font_02_sfnt_off0001826f.bin
5556242fead1bea1a9d32032261fe3646e65757969cc3b7f953a34ac54e82202
pdf-font-stream PDF embedded font (sfnt) at offset 0x1826F 10592 bytes