Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2110ac62b09f825…

MALICIOUS

PDF

74.8 KB Created: 2021-09-07 14:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ddba43b6b2e624b1db97402ad2c2d7a7 SHA-1: e31a4ffcbc070ae7d1b88fb3116381b7cbcd15b3 SHA-256: e2110ac62b09f825c2dbe06ecd77ca5f45124a94b93a3a642dd2a4df858d6dd2
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised WordPress uploads and other potentially malicious sites. The presence of numerous embedded URLs, many hosted on suspicious domains, reinforces the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://satellietgroep.nl/userfiles/files/17049560388.pdf In PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/17913103068.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/cbace67c6cd043c5db8d859000ae79e6/senabugamumudul.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b0898ece081---xarosanidat.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/3qvasq3b8id8sbb8tojgkpfof6/81649595495.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/n48e33epaa9rsj0r2vi4f54d97/lawimiveduvovivopekififir.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/80875227828.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/48551f4bd32ee6a2200415d08e658888/15787116483.pdfIn PDF document text
    • http://www.asslar.de/downloads/11809991103.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/cmbu36re29cuirrunslrctgng1/bojagumamojivem.pdfIn PDF document text
    • https://badoza.net/userfiles/file/64895360298.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/58243348012.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4f595e788---29915025041.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/bigabokip.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/19c1511394e9887ce9f4243d2bac6802/77344865208.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/db079c894a383e105630120dc5145f5b/46617081914.pdfIn PDF document text
    • https://electroagro.es/pub/files/dimalasolijovodax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=calendario+agenda+2019+para+imprimir+pdfPDF 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_off0000be1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD631 18024 bytes
SHA-256: a67128dc7a0fccd780acfee176d5692539d83536835553a48bc485a34815f57d
font_02_sfnt_off00010440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10440 11068 bytes
SHA-256: 4976c22a29fdd71728ea60b752661b46ca42fd5fd4934d85cead4b5c5717a4c1