Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c44bc3d2be9d381…

MALICIOUS

PDF

88.0 KB Created: 2021-06-28 07:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fcca236cc645122a5af903965aae96a SHA-1: 5c9746980fc1c1a8bc0a9b1af530b5065029b706 SHA-256: 0c44bc3d2be9d3812348f0c17bf7ab11207642aa0963f0627ff9a54410fedaf5
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm hosted on compromised WordPress sites, specifically targeting the 'formcraft' plugin's file upload functionality. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608afbea06ce1---boderufofagenixixa.pdf
    • http://vieclamquantri.net/upload/files/28973202493.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac127ba1dc5---zokume.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607885bf352ce---9949254257.pdf
    • https://ewdel.cz/ckfinder/userfiles/files/66642328169.pdf
    • https://aedwea.com/upload/foto/39730041644.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/mede7v3cobs6si5havd8851k63/lotujavuxiri.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a7222abca---tuvakuzativosafojasuge.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/383qe5brfqm2qcuh5s91s455bs/wamipoguwokix.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071a5906cd9a---32525687442.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a0d65db594b2d2005f6e3ff9c08fac71/37130541628.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/67557516186.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076750ddea3e---kezize.pdf
    • http://fujavietnam.com/images/Download/21739073675.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ba855c1f3---jinazuwomifuvukazun.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/6cdec37aaed6411ab50c51d4de77fbd9/58107801367.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5fccb13bf---fedawinupabekudune.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/cba904bbbfc5b33d63ce275039e9f2b6/piwekomamewipobebeginig.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/bbd2b81365a67cf5e09e808c0b6f1320/gofima.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/fea2466625bf41eebbb4abfe676b5bee/23702689529.pdf
    • https://betalinktech.com/blmedia/file/5715318929.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607381aad1052---9508570536.pdf
    • http://goodtraefarm.com/ckupload/files/66906395451.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=rebuilding+trust+after+cheating
    • 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_off0000f524.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 16792 bytes
font_01_sfnt_off00010d3b.bin
9b4c2e21c10dcf27ce64006dd3a9ab738809cad3952e67585b508400569ec785
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3B 10920 bytes
font_02_sfnt_off00012637.bin
5d42bf1f66f89fc0bbacc507c9a8d3b2760a13fd00078a49aed7a4552817008d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12637 16624 bytes