Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd3eb6efe4034d8…

MALICIOUS

PDF

68.2 KB Created: 2021-09-16 13:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c35c4e34d6d4b43baa6290062136906a SHA-1: b22b8cfdc7d6323ddea47cefc86a2eb2982ef605 SHA-256: 5cd3eb6efe4034d8fbd51eaaae2e710feec30634073ac3132e676dd8a93ecb51
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/703ri54se1bnomovt5lpf1ks51/22623642012.pdf In PDF document text
    • http://medi-sen.com/files/files/56095206853.pdfIn PDF document text
    • https://gameclub.by/uploads/files/merozozakukizuboji.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210909_190313.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/26775588682.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/jawalaminojenijam.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/tulunasilusoso.pdfIn PDF document text
    • http://hidramaco.com/files/files/rubonuveruvarojolux.pdfIn PDF document text
    • http://shamayachts.com/upload/file/rarixufavikaxoliw.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/xesuruxosalomuvefowew.pdfIn PDF document text
    • http://riversedgefm.com/files/file/zonivexevafexuwafelo.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/h07sp3jvgd75cid74t7q7tfuk6/velibaz.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/99197853174.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/xukorixigosovet.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/54509839509.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/15699784572.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/371163147.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/momeke.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c963ba7a1530e71536718a0ebf79d24d/zesez.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/2368428965.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/migugibodute.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/120957046077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=apk+to+source+code+onlinePDF 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_off0000ae93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE93 10520 bytes
SHA-256: 1008acc298beee737ac2261f3407216669323130b1425eb53d6a06d789c14cf4
font_01_sfnt_off0000c6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AB 14804 bytes
SHA-256: 7224f1dc9aa42045b6395c63cb11bdd9a655f247b4a49f9f18c87e9481650133
font_02_sfnt_off0000eb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1