Malicious PDF — malware analysis report

Static analysis result for SHA-256 4732ccea5c4e773e…

MALICIOUS

PDF

94.3 KB Created: 2021-07-02 15:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c65229e9cef32b7ede590d7de9de0f60 SHA-1: 00abbc8ed5fc5ab82f3b01186a7aa3694abc50dd SHA-256: 4732ccea5c4e773eb2e7b7e9a839eb6a81335f5d78ee6f188a175533d7ac3ab7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/613b9a6fc2902889c88d8eaa9baa2c81/dogip.pdf
    • http://dchs1961.com/clients/871949/File/61280539657.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/5530565093456e8db4d103e4f1a53644/74019050545.pdf
    • http://ilkyoukais.com/Images/Media/files/42777840732.pdf
    • http://rolmech-strzelno.pl/Upload/file/7737450194.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160850cc33c580---50760051513.pdf
    • http://dulichgiahy.com/upload/file/jebalavex.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b66b702bf---39960119058.pdf
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/birom.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7ed61d6c4---83928771804.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b1805d53f28---rediruj.pdf
    • http://luxe-pools.fr/i/File/49045797659.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160dcb8869cdcf---lagironulobomefasobod.pdf
    • http://degrossier.nl/uploads/file/32380176002.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/p578qhak9hdekellisep94t353/podipezulobog.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81403c4aa2---42416727233.pdf
    • http://sanders-scottfamily.com/clients/26926/File/gonabodupi.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609765ccd75bf---pimakuvawolesuvilovidofo.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/a399c4ea4ba645a37a7f9e0d26b5f943/4034220941.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16077d5e1184f2---wonaforerojejosaro.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/a14c7f16da9886d59851e44054614c3d/63652306741.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e54e0d9262efa62e5a2141d040a520b4/juxoguvukitosodolapis.pdf
    • http://alnadaoil.com/userfiles/file/87758858539.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/7d9ea6ba87ed1f999655adc2bf1dbfe2/dawesilogasedegos.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=calculate+the+mass+percent+of+each+element+of+sodium+chloride+in+one+mole+of+it
    • 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_off000108f3.bin
b19969fe273f39817ec1ec3a331085581a7af075fad78c7fc3e008d13f0af65a
pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 11016 bytes
font_01_sfnt_off00012259.bin
7d3cf0c40899e1ee8bb1b1ca6cb1e24576b7e004770dd69d7f59db163f7017ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x12259 18456 bytes
font_02_sfnt_off000153c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x153C0 16792 bytes