Malicious PDF — malware analysis report

Static analysis result for SHA-256 479a1251564d848d…

MALICIOUS

PDF

88.9 KB Created: 2021-06-28 16:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1238f92f0a52a373aa05f1473bdc7c6c SHA-1: 86da188b9aa8f80bcb65dee796da6a3b697c44b2 SHA-256: 479a1251564d848db516df4873f1e01742fd17b1fbbeaf1da6d9d160ad7ebdd5
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to redirect users to malicious content or phishing pages. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c5f5f0a12c71c182f55735cfe6863851/29061483897.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/defa9ef882b0d1500bccb68305d764b9/jirolazawuwuvezulonazumi.pdf
    • http://curry-box-deluxe.de/userfiles/file/26520129384.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f02645e18a---renekutetavobarusofun.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f5606caaf---julowubitoz.pdf
    • http://ggmtc.net/userfiles/files/98248116999.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3656e85123---niwinutupu.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa71b314419---48320588649.pdf
    • http://biotledlight.com/userfiles/file///69090428791.pdf
    • https://yuss.it/file/77731171345.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/409c2cc015fef26e6974ef9829c52b4e/77549824723.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2bd73f4ac---86170584659.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/a51b85248bfebf1ad3e03447fc4c2772/toxutuzutinutaxanob.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/wuliveposalarebulazux.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdeba3d68b---73253084377.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1bb2f5f14abcbff942cfbba82c0b9de8/21694095876.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f424264e52---79844014084.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c7a3bb077---majul.pdf
    • http://paillasse.hu/userfiles/file/73295459177.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/e4181b7799b2d2cb92e0dd9cd29e7ee4/satisokude.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/4039d2090a401f7f588bd9b6e371149d/76084433104.pdf
    • http://dashoernerboot.de/userfiles/jolixegojexibufekujowu.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/h51h3l7bhip8m58j797cafapo1/gefanirixubosidegumitozo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=can+you+get+pregnant+after+taking+p2
    • 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_off0000f5ec.bin
8f1d1674f5e7a6f11fdeeb56775b7e71eb4fea559741b95a70ebf7bdc334249f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EC 17376 bytes
font_01_sfnt_off00012385.bin
f0d50d3c234d046ae3637192c607714d2799696e88eeb13534fab03a52b14a1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12385 10776 bytes
font_02_sfnt_off00013c95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C95 16792 bytes

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