Malicious PDF — malware analysis report

Static analysis result for SHA-256 7debde2aa78a6e2b…

MALICIOUS

PDF

84.1 KB Created: 2021-06-29 05:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9786ab4809fd1c91ee3c5ca6cc42e4fb SHA-1: 9b6c6411edb1d0d6e5ecb8868a67c9fad2f5c77e SHA-256: 7debde2aa78a6e2bc3436b28f431cd5088e358ce6ff07de1baaed89f76e8008d
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce1259926b---sirunazutezurizevotozul.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e5f6d18c21fcc51a034c620fc52a4827/30870627800.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/552068b3633b8c55fda7b23b2e327362/duzif.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7p110i5uu4triksg5pvb7affj2/68323594050.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/ed4799995c7e27642916709a7fc57fc9/15291638953.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b378cddc1c6---47780228325.pdf
    • http://tulsamemorialclassof71.com/clients/84987/File/6442006358.pdf
    • https://betenagro.com/sites/default/files/file/93725009270.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/5b0eec1b9e2d0ebd68a497c3394b1641/7680459230.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/k4bvtmg2r6f3ctsthju42jgle2/raxiwepomupirokazodexu.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/61605551977.pdf
    • http://zrdb-drogbud.pl/Upload/file/leronewoboza.pdf
    • http://agriturismolataggiasca.eu/userfiles/files/41949281904.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc4066df79---lazokijexevofavumajaj.pdf
    • http://sakem.org/userfiles/files/91703677274.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609428056709a---tunavanikatofe.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/5810c3ac07c6519b7a4a9a8dc042bc9e/mibizapagazamob.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090615ab3689---40013507525.pdf
    • https://apotekatia.ba/fajlovi/mivulo.pdf
    • http://stardentalcare.org/userfiles/file/98979097992.pdf
    • http://iaestedresden.de/userfiles/file/xusadupemudul.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/wuwitozono.pdf
    • https://walkandsmile.com/userfiles/file/55552851594.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4965934e7---lovef.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=reet+2018+level+2+science+maths+paper
    • 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_off0000e1e3.bin
b012d55e99f37ac427b74b9c820e5efa58491b6945334d8ec3a68596af92cf91
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E3 11132 bytes
font_01_sfnt_off0000fbc7.bin
4205ec1dcbcf7e5375b267a0af9817b168dec8728ab4f66a9e8d0683091ee64b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC7 17848 bytes
font_02_sfnt_off00012acf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACF 16792 bytes