Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3c45bb38718a6d…

MALICIOUS

PDF

101.0 KB Created: 2021-07-02 04:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99a21237ad385e3329fcb858d2a7ef0f SHA-1: eb2a294824e0b2800e447e801cd2ed3a7eef2802 SHA-256: 7a3c45bb38718a6d5b29bdb73aa079f9c43dd71d0cef8615d51a1afcb8f93b06
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute phishing content or manipulate search engine results. The document body is unreadable, but the heuristics strongly suggest a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://smidgel.ru/uplcv?utm_term=r+words+for+beauty
    • http://afghansolar.com/userfiles/file/nidivisugizomezomujigo.pdf
    • https://caribemed.com/userfiles/file/mawupu.pdf
    • http://everest-c.ru/ckfinder/userfiles/files/jetabipak.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d3c41ed33ab5dae8bccbc3b79e0a7e8c/bevozefatofagugovasugebok.pdf
    • http://desagresbrts.com/clients/34568/File/vuxogafitunivovuvuw.pdf
    • https://observatoire-omic.org/documents/file/12795379483.pdf
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ranoxok.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/92855336164.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/4nbfjit9dvg1ub8ft4vt32orkv/52473026228.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/7euu1p3ea41u8ctes9e5i6mlnd/simozipuge.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/q8c981pon4uqi97t8geiip9bv1/37823883612.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf367693390---dupov.pdf
    • https://actorconseil.com/files/file/denemopekime.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/4a3p7c3db5akpur7eidc4m8nq2/10364802865.pdf
    • http://anma.pl/anma_edytor/file/67205685085.pdf
    • http://jagodkaprzedszkole.pl/userfiles/file/84203820926.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/s85jq78p7ls9e4b55o1pbdt837/84921671147.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/47a0b9924f65b03178e002223f3ac6e3/45141445456.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/degukupovinevir.pdf
    • http://bundoreh.com/fckeditor/files/file/sekuxasatifam.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/185f749f77b8e69ea2525f964e094284/51644083820.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a52839127e3---39872508929.pdf
    • https://bititechnika.com/uploads/file/67190341606.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e745b8bba---68481110211.pdf
    • http://ellerbeefamilyreunion.com/clients/874543/File/vizuj.pdf
    • 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_off000127e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127E1 16792 bytes
font_01_sfnt_off00013ff8.bin
435984f53d14e717ddef603161ea14ad39db703c5a0c284357542d50c31467ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF8 10588 bytes
font_02_sfnt_off0001586b.bin
cc62d5e4b4a65cc8f0a937d84acd2a897d2e37e89a6ace2e11bd77643abac764
pdf-font-stream PDF embedded font (sfnt) at offset 0x1586B 17248 bytes