Malicious PDF — malware analysis report

Static analysis result for SHA-256 a722f0c38dd9cbfa…

MALICIOUS

PDF

74.8 KB Created: 2021-08-28 04:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cfdc915d14e6bf78602125bfc0f8266e SHA-1: b2c91b86321121ec64d970852b23443ba5ea2596 SHA-256: a722f0c38dd9cbfad1aee11c45b4ee5ab1113845e738190fb3dab45ecb410b46
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the heuristics and URLs suggest a phishing or malware distribution scheme leveraging compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092492786b8b---62664156462.pdf In PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/pevemakoniwi.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/22821428909.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210607154713.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/7747522871.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/b9ec7hkgdqiv4hnoldecgiv91e/96674674795.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cdea27447fc---42714301743.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16093ff5fd5af1---525593471.pdfIn PDF document text
    • https://vientangluc.com/upload/files/71703905601.pdfIn PDF document text
    • http://imi.vc/upload/files/zagupiwajowobaxozukaku.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858bf1772d7---junujofajogafut.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/69870762412.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a82325274---54335434520.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/83704533798.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/kabopipinajijetivevaras.pdfIn PDF document text
    • http://beiks.info/public/file/8307237074.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/e1501d3e043f848426af20497bf09ffe/47131816654.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/mutuza.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c1f3660c3---ralivamod.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/8788d849a1bd7b5c69ce32e5700ca2a1/nalulawasanavig.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210723_F5573567650ABFE8.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/66400779194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=yearling+filly+for+salePDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/93931187859.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_off0000c104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91B 10388 bytes
SHA-256: 7f1f386086dc8645f74e34cc2ad58a89f505b1ee7edaeb494241b5022ec6533f
font_02_sfnt_off0000f0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 17392 bytes
SHA-256: 550d4019f4699cd9086dbb9b00703bf1abeb3e120cdbf995f9469403c161e08e

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