Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3cb3d074369b530…

MALICIOUS

PDF

80.2 KB Created: 2021-09-09 01:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f147d6f0c0d62ac41d760c3ce739d23 SHA-1: 715abc9814c9bb949e3082b383b28c1256156dac SHA-256: e3cb3d074369b5301a79befc0f8ece904f5bd7286bbc65170f8866b4e735353d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics points towards a tactic of redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://membermimpi.com/contents/files/rudomaruwabunar.pdf In PDF document text
    • http://www.anclupnapoli.it/userfiles/file/12800400171.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/vegejijudafu.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/rigabelinugejogizafi.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/97406270275.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/vepiferer.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/mavogaguj.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/20045690251.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/52607797056.pdfIn PDF document text
    • https://promise-land.com/upload/file/11806902245.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/31774288918.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/ribakikijajotolukexasedul.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/94573559436.pdfIn PDF document text
    • http://machin.kr/userData/board/file/91520618526.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138b9ae49d3b---zirevomepa.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d9b8f220e---lewajoxug.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/24288745581.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/85992254664.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe3d00d58---wiwiwonajarovipokepirab.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/demopidowu.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///15016577633.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/norowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=pasu+samrakshak+appPDF 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_off0000d652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD652 17940 bytes
SHA-256: 363db85ddd2df3615ba0181bfbdd56a6b31d3bd559ace6025cf091220c5aa08a
font_01_sfnt_off000104d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEE 10116 bytes
SHA-256: 457ee2f1636ec1d7650392a0f4a7d35bcf4a4d3bce315217c5de2eadc2e1d621