Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b7222108672cc5…

MALICIOUS

PDF

74.9 KB Created: 2021-10-05 05:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8ff6f7c81e69e2167c46d673d862e4b2 SHA-1: fa4838c60275c7d4f960bbd39f8ed67cbbcd62b4 SHA-256: d7b7222108672cc5449cda7f4bbc89f13bcbf5733f4f65c303a62ed57b78e0a1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Some of these links point to compromised CMS upload storage, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://cochemical.com/upload/files/7229556210.pdf In PDF document text
    • http://paolacaone.eu/userfiles/files/51962718561.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/mukegeziselorem.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/e60ev419g6ljvkt96n1r5kacq7/suketutogugumesuro.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///27699043531.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/nibakefuvufedaruroxug.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/tiwotitu.pdfIn PDF document text
    • https://wilde-signs.com/media/83930570301.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/49294807386.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/37444156698.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/tvlf43u9pcve3sribhs93f0f58/bidipazikum.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/56367992208.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/penajudafavuki.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/bumudavubotikomiwemipi.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/lunusuzena.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/24951980852.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/balajanezaguxet.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/gizukuwu.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/66299260284.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/finorogopofub.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/58829423190.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159ea8bafc0c---21826310851.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/pizaxigafudupolopezekuf.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/setovarazepumom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+many+pints+are+in+12+cupsPDF 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_off0000c1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EB 10952 bytes
SHA-256: 0f26cedd74f94935659cdfef98047b9d5b701b7ee27f40e853c9e05130d55d07
font_02_sfnt_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 16440 bytes
SHA-256: 423c498d5b0103c7236fba1a0bae6f006e9a68ae3494696fb7d50893170a615b