Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb59516900fb9e3a…

MALICIOUS

PDF

79.3 KB Created: 2021-09-21 19:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f5058d766acf3af36af11644633a629 SHA-1: 0627d6f6a240007739ec1db50a9c19f84bc101a0 SHA-256: fb59516900fb9e3a5b158c5330637cb085ff68c2e1661a48cebd51814af7caf4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of embedded URLs, many of which point to compromised websites or link farms, suggesting a phishing or redirection attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=how+to+transfer+downloads+from+phone+to+computer PDF link annotation
    • http://leylatoprak.com/userfiles/file/54117505906.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210914_D2B4311F714FF089.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/14477928971.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/82582565029.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/punidimi.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/lefizajabiwutipen.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/didowemevogowonivu.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/39410814018.pdfIn PDF document text
    • http://reopen911.info/media/file/87432426684.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/gariwimotumuz.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/60974323536.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/xovifusuzedafivorom.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/4575559894.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/dujumaku.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/logigokun.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fff5c6a566---55456361953.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/62527271752.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131fec70529c---lujibuzukijobipapeferutaw.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/2fc77d240ace4df75a0f2aa270e1c41c/falojenif.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/b4901232d7caad5beb5103b86261c306/9888824203.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/lovaxa.pdfIn PDF document text
    • https://znalac.com/userfiles/file/negoxamunir.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/14221386697.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_off0000d149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 17476 bytes
SHA-256: 5e908013524aebdbb4830179f599717501b070d510610ebb02b4a2509cdec493
font_02_sfnt_off0001163d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163D 10968 bytes
SHA-256: 3fa77f91700429ef5c68ebbcd82cc43ccab90cc8b86a7914117f85504de1c609

Open this report in the interactive analyzer, or submit your own file for analysis.