Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fee2d57084bdfeb…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 18:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ccfb9b838c313803434bddaaeb2c0d26 SHA-1: 1cf549ebb7e38bfbe3a2ad5c4a6b5e67183cba35 SHA-256: 2fee2d57084bdfeb827e13dd2e21e5e63674920aec002cb02df586668367354b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of link farms on disposable hosting or point to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF structure itself is also flagged for suspicious link farming and duplicate object bodies, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=nuance+pdf+converter+professional+8+download+free PDF link annotation
    • http://canadianrockies.info/files/file/20480387471.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/60254504389.pdfIn PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/xabisimusuvitivuwuk.pdfIn PDF document text
    • http://museeducuir.org/upload/files/jefawawasupeniruvijogoba.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/34134304221.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/75g62oougs28qb2e6pj35nh7k6/18663235350.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/51618605268.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/kiwej.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/9m3980qk71pfsdtshi2ckckffh/3048448810.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/45928584931.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608654d62dd37---88806829943.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160865c03b0ce2---8304190878.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/7bce09b046318fa29b4720caf4d1aaa0/zaninefovifejolezifaxedet.pdfIn PDF document text
    • http://eko-uklid.com/files/file/xokujizat.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/golopu.pdfIn PDF document text
    • http://scsytech.com/upload/files/59019333687.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/migowilolologapop.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/66262648427.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/tepazez.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085134a0360e---tatutejusesenefuwakobufe.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/c3e0filh8mmt9c96jshl9f9sb5/zawokiwerasebagujamokifib.pdfIn PDF document text
    • http://onelove.cz/file/62915643832.pdfIn PDF document text
    • https://premium-house.uz/images/file/vupofokavevuxumonikapaku.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_off0000d664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD664 11052 bytes
SHA-256: c128ecd669e58ca757af5bc9d2b199f811e45731e1959e7231b0f24a6b12c59d
font_01_sfnt_off0000f051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 18252 bytes
SHA-256: 90e443b35729a4e0765d595e42c28810650a3f6213f9552a52ee12b3504f00d0
font_02_sfnt_off00012029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12029 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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