Malicious PDF — malware analysis report

Static analysis result for SHA-256 28dacf9919b83163…

MALICIOUS

PDF

106.8 KB Created: 2021-06-25 20:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 322970c311716d921c02888ada4a33b0 SHA-1: b43378ba595bb969d117772cd1336e41fe732075 SHA-256: 28dacf9919b83163716cd7d7ed966d92110855cb2c6a9ad9ee3e595c982796fc
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The presence of urgency and invoice lures further supports a phishing or scamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 8

  • 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.
  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/h6ghdf9c90maeftfth6hmr6rkl/57280218564.pdf
    • https://beauty-full.ru/uploads/files/80297828969.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc06128a4d---rovexarawim.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073285c9e2b0---wojudozud.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/aae1ce501e262c4dca0288a840d8b6df/milikujuze.pdf
    • http://vhktn.at/images/content/files/23222102414.pdf
    • http://atomleasing.ru/media/File/70468289314.pdf
    • http://aihyang.com/userfiles/file/tawakupaponoze.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/8d41a0cda44f92a15b208d8304c8c0a2/kukonilizademab.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/6fda9f05372116f3bb9d93a8d10b66a6/pisadafumumujipuwone.pdf
    • https://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/9i8s2hqqoso0j8nmglbcqqdm7h/9034008520.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/af392a3480533ee6f204d80c67468b3a/labapus.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cd904c1bc6f---dejipejufenezukafekusor.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797b6f723bd---47913065884.pdf
    • http://szpital-sulecin.pl/images/fckfiles/file/fujonenajujedeze.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/e35u6557cda1pt7aqfeon0qfvp/17662850354.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2834d93ef---nigewobujadezorafofune.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b80312beeaa---kemota.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d72586f7e1---mevexipabebipukize.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/d1a0ba9168f18dc8229562d447cdd77c/zinukafuzuk.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/baf0f142bdb3627bd31314fb53b59d50/gavemigaz.pdf
    • http://bhk-aindling.com/userfiles/files/lawifodojetagamutaduji.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef6f74407e---boxuwononajawekovu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=manual+paypal+payment
    • 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_off00013e75.bin
4637d3107251cceaf69acf1c72b5f969e93387a3a7dfb68a69ebf97855a52a34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E75 18000 bytes
font_01_sfnt_off00016df0.bin
4df6d877fa4ab430c1749389466d100e704b8133866d970b975d105b19c1d235		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16DF0 10140 bytes
font_02_sfnt_off00018498.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18498 16792 bytes

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