Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e41db61d06c70c8…

MALICIOUS

PDF

70.3 KB Created: 2021-09-01 21:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0b152744fb2d395be7daba58b7d38878 SHA-1: b6f9c67e1d33270d9f78c7aed8bfb6b00a0e43c5 SHA-256: 7e41db61d06c70c8b8e891b47e198073c48363bf599c66a72b79e1888c8062e7
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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 http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fee854196b---28317681877.pdf In PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/bipujokufalaz.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/0fc3bf150ac4ca59d7bb357670d56ee6/29215475779.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/fivikabikez.pdfIn PDF document text
    • https://mmszke.hu/files/file/pumirovorobifat.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/9c3dc10d27bddf1c459bc62328098e6e/talesadexozawijotur.pdfIn PDF document text
    • http://attlas.center/userfiles/file/xurefofoveg.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/12434358043.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/4585394285.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5d979a78174c0b444962e45a75ad7996/20172514707.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afe7839f29---manodabitutojoperanof.pdfIn PDF document text
    • https://sharenkon.com/files/97871814131.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dfdc8bee376---32541894667.pdfIn PDF document text
    • http://yulintimber.cn/d/files/megulovovenavalijuzuda.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/74710104728.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/3596215698.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e000c5403---vatebezeporetifej.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/71714053263.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/av4a3ra15dfjk5pdi16bndmvq2/29842387494.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c5d6a8c2c192af8c55c059863d6fbfaf/modesumade.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/75746607103.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/39431581392.pdfIn PDF document text
    • http://yuha.be/_files/file/5077381485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=indian+pop+songs+mp3+downloadPDF 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_off0000b383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB383 10612 bytes
SHA-256: 802281f0e2cf74570f10f3c8890ef5c6fef7a7b85f2da35ba54205ec67da5a56
font_01_sfnt_off0000cb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 15696 bytes
SHA-256: 5c35af14f7a41d6f95befb76e1577d9e6cd82206ad515ddff71a35946c67d95d