Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e31c8b4b7647f2d…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 07:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a6d7e9eb3b0cad3cf96896cd98ec3357 SHA-1: 26341e1efd9d34f68bff0e0845000ba0eb0a6cae SHA-256: 7e31c8b4b7647f2d373d3270d5ea87f81ce34e0f522fc9a1947ae4a27c7eccbc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to other PDF files hosted on potentially compromised websites or disposable domains, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=vmate+mod+apk+download PDF link annotation
    • https://huuphongplastic.vn/uploads/images/files/97089807.pdfIn PDF document text
    • http://timebymtm.com/upload/files/14753189716.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/76518337997.pdfIn PDF document text
    • http://scro.ru/pic/file/latigefifavafi.pdfIn PDF document text
    • http://besteva.com/upload/files/82853783843.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/womesesasisofe.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/9691727161.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c77a7b411---sexaranupalivege.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7aad67afd---98164773394.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/fetiguripewakegakesi.pdfIn PDF document text
    • http://talesma.com/E/file/30684701410.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/131821104340.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e03afa8c91---19217011848.pdfIn PDF document text
    • https://sanagustin.cl/files/xiligokiburep.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/ketefevuwutosamunavis.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/sojedubokab.pdfIn PDF document text
    • http://laduses.nl/image/file/laraseru.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/4703525488.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/jarexemijididukobezatojip.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/913085632.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/fugedababipox.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/56994926561.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/wepuxejo.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/fidefewaxisezepepezo.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_off0000e2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB8 10340 bytes
SHA-256: 3672f7ce5aa45cd092a9a91e94fb0b48ede191ae8a2a0a8eb6e3db1979e34639
font_02_sfnt_off00011214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11214 18984 bytes
SHA-256: 44f58df66bf0ae14224ed8566e6d348b8b7ace187664be8f12ac287f8c89106e

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