Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d52b5e7b6abd0c4…

MALICIOUS

PDF

87.0 KB Created: 2021-06-30 04:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75988895b21714d9372e326ae6ae2216 SHA-1: 1d07067134913445b7abe052d03ade7c9656e0f9 SHA-256: 4d52b5e7b6abd0c409d4c1cf42733038b8649aa8f7d82c670243c2def06d2c13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befb191d5ed---67205532119.pdf
    • http://blackhorsesc.pl/userfiles/file/70901701981.pdf
    • http://cokhitienvuong.com/uploads/files/gunafovo.pdf
    • https://driftwoodcc.com/userfiles/files/widubigogepepalop.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/953f918a4f8942d6a3d63b19221240b3/34812309380.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/30672850933.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ol6pnsn2pb0s2lv9mon2j1sfha/20695087037.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8095b7f0b---61498607917.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160991d71dfcc2---88176980598.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866c6342c41---69500636045.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a408ee746f3---8600650280.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/97f950e7c96429f2596b015f81e64f5e/2274607654.pdf
    • https://htddienstverlening.nl/userfiles/file/datuwidalux.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160863c7787ba4---dowamorupuwalusoden.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/43cfcdda0a164c2a74935b850becc6b1/turijidufumafawulubefifa.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16081207b5cf99---gidijapusatokizebiwadozab.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa3299c9c---98003110265.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c178174ba67---45042281469.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/9b81a451f7e786ee074b189bcd0c558f/luxinujijebadosus.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1ea2f375905e10b496ea7fb704a61987/47024697247.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078811a26770---91925550436.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=rice+or+bread+for+weight+loss
    • 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_off0000f27d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 16792 bytes
font_01_sfnt_off00010a94.bin
5b4a0679a5a9916af579f5be8699f721de8f6c72642d0cf2f661e9d8a9a083e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A94 10924 bytes
font_02_sfnt_off000123de.bin
31bc539b87c780e78fd23ad18fbc6c80e8a68a3ff7b9bc989fddd96b9eaa6418
pdf-font-stream PDF embedded font (sfnt) at offset 0x123DE 16692 bytes