Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3be415a1bc93959…

MALICIOUS

PDF

69.5 KB Created: 2021-09-19 15:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cd0c2a4419110395f12e60b773c8341c SHA-1: 2a5180394da0b2fdfae3003140431108330330ff SHA-256: f3be415a1bc93959a6d45a5bdc1d7ac66d9d96be32b6a06f4eb589e2d2a52817
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF_IMAGE_LURE heuristic indicates it's likely an image-based document designed to trick users into clicking a link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://laborke.ru/uplcv?utm_term=happy+bay+pro+apk+download+for+android PDF link annotation
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/moxalunobekosadal.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/pufiporawojagonozezamasog.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/dazotujened.pdfIn PDF document text
    • https://limadelimon.com/images/file/xitewapogopimeregi.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ec68bac2122db11aac4db3290e764e3/kawozuzirolepezewasi.pdfIn PDF document text
    • http://tulga.ru/editor/files/zulorudesidezonesatofa.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/37413278844.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614074d09bd76---94112463841.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/zebemoxidonawepexenu.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/xugetire.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/26352857768.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109102359416030.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/eb2f8da7abedfe74656f8dcbb9217a8b/47908065422.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/1ee434be6e87e78ffd3ead68f1243e2c/sesopamavi.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/22962610884.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2034b823e---43124036829.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/dusikavuzumulopa.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/1814030194.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/vexijajalarewi.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/46270161061.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/8970434537.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/9372383763.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/12495079343.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/nekaforosifidawanifibezo.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/95419053752.pdfIn PDF document text
    • 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_off0000b2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D1 14216 bytes
SHA-256: 738948e3dafddc95657ff39d54e2c18eda5b130a3945ed85497d5124e291f265
font_01_sfnt_off0000d624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD624 10516 bytes
SHA-256: c0df5058337aa9c2589bc803113bded37eba1a4a40f7d2069b742b66a54d47c2
font_02_sfnt_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1