Malicious PDF — malware analysis report

Static analysis result for SHA-256 2193a42bdac9f831…

MALICIOUS

PDF

83.0 KB Created: 2021-06-21 14:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 116e8c90e774cb22eb13c5c488be8c51 SHA-1: b200483d96e3691d9045bfa04d0bb14c3bb92ef8 SHA-256: 2193a42bdac9f83101e2f947b39d7051fce4733845b5a73a8de3e87a9a10670c
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it's a link farm pointing to potentially compromised websites, with one URL specifically hosted on a compromised CMS upload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or scams. While no scripts were extracted, the structure and URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/6240e1e73f3d4a2fd68c964e2b979981/71001817597.pdf In PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082062214b2f---5309301190.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/43072725219.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/07ed3e35657aebd5d6d836a358496f25/7051230584.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ada7fc6845---topojotutazogige.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe1bea6454---81583240334.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/kagusibugokufutatokamexaw.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/75465054585.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/vg9fsqbb07blvtnrhro1etsvd9/77465650959.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/35381790162.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97d638fcbd---duparipuk.pdfIn PDF document text
    • https://led7.ru/file/jijozo.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/63556818641.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/85529735228.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16080ef48182bc---74329409262.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097b5b627360---11829486492.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8b513eecf---tabaduvo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=barbie+dreamhouse+adventures+season+1+episode+7PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 5548 bytes
SHA-256: a738450d6cc15eaaeb0f81ceb16233b7ec8bd778aeaa07c8f520e04e5cd8de6c
font_01_sfnt_off00010608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10608 6008 bytes
SHA-256: 653128fc2d9505d314d2d970816bacfee79df980094b5a4db9e7fdfb0e595554
font_02_sfnt_off000116cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CD 11424 bytes
SHA-256: e97f7915d6482e3ca69e493396ad7ffb02f53e38510c02323c40455193f5e246