Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b56fc35edd18dd4…

MALICIOUS

PDF

75.8 KB Created: 2021-08-28 02:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9c99528d9864ab2b64a182d917c34cae SHA-1: 81d4bb03348887d2671a95d93742864e1ff987bb SHA-256: 3b56fc35edd18dd406ac0a8ac2c64385d04b95d8176b47333cc4f932288c499b
156 Risk Score

Malware Insights

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

The file is a PDF that has been flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous external URIs pointing to various websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://limsurempat.com/contents//files/4462891180.pdf In PDF document text
    • https://aonetreks.com/uploads/file/pirugilotujosunoxopisir.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/k3qnernq173tl34iuog79am894/remiledukoga.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/65151910769.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/6593d055062944878c34bea550990ec7/56719930592.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/82766599895.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/18624452174.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/zovawajukanofesenigu.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/8036184883.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/95djfkskediglsarp9gus9jcbj/nejoturigitazoje.pdfIn PDF document text
    • http://sadrainsurance.com/UploadedFiles/New/file/22765199567.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/5310822779e813d8b382f55175baff18/gosuvawuwekopokunun.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/q7ppad031rs2nfn9mcuu88qui8/45241441230.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/77e471fc36bea6e0133e4ab83223b0c0/59844132056.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/93854011710.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094a480cd4a3---dubev.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/72198238428.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/75b3a0f180cd03a48dd2f5cca387c291/18220646965.pdfIn PDF document text
    • http://gptools.net/userfiles/file/58713328377.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/nopuletalogeniru.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16298837088483.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160846f8d16f05---xebekonanetuvu.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/51158859555.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161105b64ae4f3---59940786156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+quickly+bamboo+growPDF 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_off0000c615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC615 16396 bytes
SHA-256: 5083496b8da39eb7de672aed9ce48c6b8cbc622ab96325133e527702ab3c6b3a
font_01_sfnt_off0000f039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 10740 bytes
SHA-256: bc3f4a4cf38ac4902016b400e4fe08067ec6d1daa7a13ed8a81ce21ad70105a7
font_02_sfnt_off0001089d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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