Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc43531b7b426f8…

MALICIOUS

PDF

88.5 KB Created: 2021-07-03 08:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9c96c4b970b762f93182574acb3e623 SHA-1: 70df6be1ed12db20fe7e0d4d97d4767e411b84af SHA-256: 0bc43531b7b426f84546a015205e612cf1f4ff7bb8d7705e94d00b32070c9d79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://divapharma.com/uploaded/file/korosu.pdf
    • http://lucann.com/Upload/file/65280559435.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3c820d74b3e8e68fd37a2a1fc960924d/reviwakazo.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/58247c0b63ccff51a57e35f336d38bbc/7499377302.pdf
    • https://ms02bet.com/contents//files/16409985445.pdf
    • http://adance0112.com/upfile/editor/file/sowegimokukilepeda.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/5fqdfja59slgu297ksnj6bh2j6/ximidugopanofure.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2cdb06c76---sovulirilogurinijoxasokal.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/f9f4b76f31857b344c03cb0566acdc86/25266257692.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/13a08cd20cbacda27938d291b88d8f2b/71222460234.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/brjltmmtcfoaf3ha5qjlfch1s1/76900010477.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fae52e496---bemujakumokudatixov.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5685990354e3154aad0b109ae96c2287/batitokutupevifik.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a613c1ed02a---bopopuwitidujokojo.pdf
    • http://simonhoirup.dk/userfiles/file/37635557299.pdf
    • http://csc-0898.com/userfiles/file/20210627115552_jp55p2.pdf
    • http://pro-elec.ru/ckfinder/userfiles/files/fewopisemisusemiwiwupiwu.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd4d1ce1f7---16501979456.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075955616b23---12161540501.pdf
    • https://antae.be/app/webroot/uploads/file/47954299977.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/kujupifogetoduk.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/f1e3e17f40db1b95c1902e37b09d568b/50431786522.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/tavesokegidoxem.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/blfcfnh4ddah36mndvg0k0l0oe/kunifosekulewalivirefofe.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6a0ae4e50125dfe5d92beb5b41fe45b5/90330535416.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sleep+as+android+supported+devices
    • 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_off0000f73b.bin
ab9699d9be8d30259c85ddfee774c0d7622403a2517ca98bc0774a94ad8f5ac0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 17148 bytes
font_01_sfnt_off000123e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123E7 16792 bytes
font_02_sfnt_off00013bfe.bin
a8890dd02a917fed7e14c45f8e1a2e4d93a70703d130d4a5618f759989f9bd7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFE 10748 bytes