Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c85b0e665a83d99…

MALICIOUS

PDF

138.6 KB Created: 2021-09-03 18:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: db0be31446deae01796f2231257e9e48 SHA-1: e979a073de548b76be9d2baf696f2e5e76d06afe SHA-256: 2c85b0e665a83d99309658b446d7aea3a3110d0aa48eededdb1d13883f59889a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics suggest it functions as a link farm, directing users to potentially compromised WordPress uploads and other disposable hosting sites, likely to download a second-stage payload. The presence of embedded URLs and the 'SE_INVOICE_LURE' heuristic strongly suggest a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ludifrance.fr/userfiles/file/71907581920.pdf In PDF document text
    • http://huichem.com/ckfinder/userfiles/files/wezepajotusejoxu.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/kh2qu8ack05lv6pv09mma82n06/kamatipigora.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/fsm7hhel1kuvakfmr2np1ubhj4/10205070722.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/2751683105.pdfIn PDF document text
    • http://metapolar.hu/tmp/safofasen.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/29235102436.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb14ae3e8---xorusuvo.pdfIn PDF document text
    • http://sartor.ru/upload/files/36090128813.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/77836522410.pdfIn PDF document text
    • https://clove7.com/userfiles/file/35685072694.pdfIn PDF document text
    • https://salwangurugram.com/files/sufekeguredaluze.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/59268784958.pdfIn PDF document text
    • https://bselink.com/userfiles/file/8376763493.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/pelabujawa.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/susare.pdfIn PDF document text
    • https://sukaunited4d.vip/contents//files/fugalekonikuserewuxorimo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e44f7cd619ef58adab08b3e130f070e0/96477094710.pdfIn PDF document text
    • http://runo34.ru/attachments/file/tigawopobubigon.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/lanalizejoku.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/i9hj71kjm05s3e1ku82d9438e4/38115834954.pdfIn PDF document text
    • https://medtek.vn/storage/file/49980929673.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/vixomodenimukezodegoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=registration+act+1908+pakistan+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_off0001b8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8BB 18428 bytes
SHA-256: da012e85adf78b1f379ee78e87545de3a81e08ced0de178dab3dd8529f068bb8
font_01_sfnt_off0001e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E8DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000200f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x200F3 11436 bytes
SHA-256: b9789c58497441e572d67e92e91032b0561a83cb6325ae8c7145bd1f53a30f06

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