Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f70d7e177df9a1f…

MALICIOUS

PDF

126.4 KB Created: 2021-07-13 18:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e89c5390bc79a340331612ddb047371a SHA-1: aaa914f6ca1c2b99d2cdc0dc5392eba72e4ec346 SHA-256: 7f70d7e177df9a1fc28e696769c2c0bc8076b25d733b6e5aa4e83b5bc6555f74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains or compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://cycling-software.com/files/file/wawozuvujege.pdf In PDF document text
    • http://washchienluoc.com/upload/file/gajadafowopujixuj.pdfIn PDF document text
    • https://beaszemin.com/files/460339259.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f8924dd4b---pewakumugodugupe.pdfIn PDF document text
    • https://baongochoa.com/upload/file/nanixizidubevuxi.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/sisimuvapik.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/7ea6553c1cda391bee036e21173b959c/33119658068.pdfIn PDF document text
    • http://vralumni.com/clients/7/71/71e0d721b250bdad3664bf54e70089ab/File/fiwowakinubeneno.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/0777339f2d2934889e4622fd85e5c7b9/gaxuvobejariz.pdfIn PDF document text
    • https://nadamasristorante.it/file/59023291559.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608305279fd99---zobarojovonize.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081417673ccc---27336165571.pdfIn PDF document text
    • https://airshow-bg.com/file/54833303311.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/43478f6d827da94e931af16d76e8d0bf/41616259618.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a969d617454---senebuveguwerezinosom.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/06/18/76376252417.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a279303c47---22977634390.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/4066886546.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb498ad049---dimokorusetakinadadu.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/96364225128.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/23c2ca90b560afd37d67cf776e148b95/nerupuzutif.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079a3cbc806a---11177743226.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/devamenurefutovoj.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089d5bf1896f---zaxokomasavosuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=frizzy+hair+meaning+in+gujaratiPDF 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_off00018c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4AD 10604 bytes
SHA-256: 06259e791d48845b32a6bec23706188bedbec1927ea99e7e1583b3c416e0a46d
font_02_sfnt_off0001bcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCAF 18444 bytes
SHA-256: de66117cc72c912268c9ca62121ebbade4eea63420fd4becbfac7bf7df6f432b