Malicious PDF — malware analysis report

Static analysis result for SHA-256 74481058342772eb…

MALICIOUS

PDF

92.8 KB Created: 2021-07-08 04:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 56f942fbff5d57775cffccd58fc05158 SHA-1: 98d041372bcabac1f404c5fdcda4a0f47fb1db1d SHA-256: 74481058342772ebea4bce43a6d635bdb9201b0369e27d1fc2a1e8b07f99d53e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://tantecoccole016.it/file/83853641708.pdf In PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/664d15fe1ec543a33076d0797c0cabb8/90433256929.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609028d969365---60067634600.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/92937439753.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/lazapanipekoduwokoxova.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d312e068d---gobesisux.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/2sjittahihkttqujnmrjmdrslq/puwulilej.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e492dbfb13---64136934165.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/8oj8o35jo4khkn08lib4v3llpu/tujifusurekasosi.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa80e7ab07d---7013799185.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/29f1a02cedf49249738b47a5c62dc15b/sonuvanijepenirawuveweg.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/7777790155.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/8011afd2d2d9d924005262ad469383bc/92433177176.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/48vft4h5anomjf4nrq4f0d8vc4/bonajafukoxirafinimabip.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/64691108815.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/pavujoj.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210707_ABF1B7BC28C16C8E.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/jinin.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/26000438103.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/04e39c8afdce73949ac9bad9cbc06565/34175832155.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad68bea17c4---59393537426.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160813cd38bb14---devegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=workout+ppt+templatePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 10232 bytes
SHA-256: 52861893e284934f7d2aaf2de7630958afe8a9247fbaf3cb38546ad248ac6c8f
font_01_sfnt_off00012146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13958 17264 bytes
SHA-256: b1c12e711b04568e7ef183a46306eb2354ebbaaba0739ef1da2dbc2dbfc4541d

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