Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70caec9e4a4fb7d…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 16:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b049ba4f351c64d496d912d2edad0835 SHA-1: 0fc1c67a2ace60bf328a29156bc56bdf3dd6a448 SHA-256: a70caec9e4a4fb7d0716c1e2527e13fb0a8641dfa11ea5687b06a47f9601e6fd
176 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with several URLs hosted on potentially compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or scamming purposes. The document body is unreadable, but the heuristics point to a callback lure scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=upside+down+minecraft+house
    • http://heninrealty.com/userfiles/files/satunawutodeg.pdf
    • https://pokereshop.cz/data/file/danapajogefagutakex.pdf
    • https://divinenine.net/userfiles/file/xajorepub.pdf
    • http://e-sportis.com/images/upload/55939797724.pdf
    • http://mtkshop.com/images/uploads/file/71212363803.pdf
    • https://mobspace.xyz/web/img/podborky/files/20610042103.pdf
    • https://abyway.lv/images/ck_images/files/30576769836.pdf
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/pukunitupibal.pdf
    • https://tectrongim.com/uploads/file/39566547510.pdf
    • http://clairvoyantinfotech.com/demo/images/japuxaru.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161334603372e0---65901149555.pdf
    • http://bularz-auto.pl/images/userfiles/file/77154093969.pdf
    • https://crcnueva.naturasoftware.com/uploads/images/files/koluxamipixevosaneza.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/aadae631d7c55d1b95350662621a0d4c/sarepevimixuguj.pdf
    • http://www.tramag.pl/upload/file/78638319030.pdf
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/tenajuxamulariparak.pdf
    • https://indianhairtransplant.com/ckfinder/userfiles/files/3670362296.pdf
    • https://horgaszvelem.hu/ckfinder/userfiles/files/80624458261.pdf
    • http://oppedisanorobertosrl.com/userfiles/files/devefoponulofugi.pdf
    • http://kronikarp.pl/ckfinder/userfiles/files/64915820852.pdf
    • https://rumusjitu.com/contents/files/vobajabetevubafopugedabiw.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/bf7f0cad78d7b3e86c831664f8e22ca0/pajopuwivin.pdf
    • https://samsungdvm.net/upload/ckfinder/files/73718590815.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_off0000d317.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD317 16792 bytes
font_01_sfnt_off0000eb2e.bin
eae6211721c3d6d6b6b6c4495a9920dea5107818a194a0a8d403e733fa150947
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2E 11032 bytes
font_02_sfnt_off000104b0.bin
9b4f23ca3ce3d04c678cc447ac2ffdfdca009c40a51ecdfc87a66f22ea7dd59b
pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 17256 bytes