Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be8b2fe44df2eba…

MALICIOUS

PDF

76.3 KB Created: 2021-09-03 23:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c639c568483ab23e1ab4e218eb940e31 SHA-1: 5e431fac75fcb11c397950e8a190c45f52562bdb SHA-256: 7be8b2fe44df2ebaf119d5a43fce990777035be4908512ccdfe7a5dca664b1ff
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting sites, forming a link farm. This suggests the document's primary purpose is to act as a lure, directing users to potentially malicious or phishing content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://around-sicily.net/userfiles/file/74381713687.pdf In PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/u8p2q09vfhfg3jn193cmha1373/gozos.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/perer.pdfIn PDF document text
    • https://aspirans.com/files/file/72981466953.pdfIn PDF document text
    • http://arslanemlak.com/E/file/8383516888.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/posiwulodob.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/21b3a85f8781f7b46c655a0baf03121b/60718352375.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16109fb1f03993---xipaguzopureju.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/mamekagakidogaf.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbccbecc86---8137544923.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/tazozivikenele.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/8f092c9ec7601ec80c048e3cab6bf85a/73125112674.pdfIn PDF document text
    • http://laduses.nl/image/file/93911188154.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607905dbbce10---26977020575.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/36866403113.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd1e31bd7c---27858231548.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c6767acd6---82294025639.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/zejeruwoletokasusesil.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00b9b11ccd---89705062032.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/9ol27iiikaeh226soesminth50/buvilabogotigoluwir.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/22769417120.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/vedowajeror.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/26298654441.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/zikimoriwefepi.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2aa91afe5f---96121119794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=manual+de+peugeot+504+pick+up+dieselPDF 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_off0000c27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27C 18404 bytes
SHA-256: 7f3f6687d405aa8e0a5f145b743287d0cd7c1476882b72b3aa233743958a4316
font_01_sfnt_off0000f256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6D 11108 bytes
SHA-256: 1a8604b086ad83c453412b68b4f8390274e866e12478af8a7df5d88044996c88