Malicious PDF — malware analysis report

Static analysis result for SHA-256 e32aacef790bdbcd…

MALICIOUS

PDF

104.1 KB Created: 2021-08-04 06:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: f13ae7dd1bee9f5c7797131c119bd96b SHA-1: c8a06e3840fa61842b3f0887addb370b2c05ddc2 SHA-256: e32aacef790bdbcd394185627cc247e170a1a4082a48c33e5b918e67878257b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://mdbim.pl/ubezpiecz/obrazy/file/29203158712.pdf In PDF document text
    • https://healthmatters.me/userfiles/file/84429398596.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/367276800.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160752120dea59---beburodo.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/fajapek.pdfIn PDF document text
    • http://falerisztika.hu/tmp/tedudafolu.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/gq0ornspgbvkvdjb5lvrbb4r7c/fenejufugitigurufu.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/da28c95bde2876eb4ff1e87a9be13d99/bizitujezuvudi.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/3090154649.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079df0cb5981---potexupebazugebawibepofi.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/cnp1tmi9elp1mkgtmhesslnu5i/63757762916.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/merilanabomepotumarujom.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/87661782948.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/d2c613bbb9a2e4cbbadd96f5f454deb4/19654358901.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1627973101.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/45172019517.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/9i01e8olou53ke3lno4qg9iue1/wovopixefovikolidef.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e1bf72ffe---53886996622.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/69541850456.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162234936437.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021072712545431.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/ribizaterurer.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/91088880924.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///44992116327.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/63793991206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=maginels+portable+wardrobe+closet+instructionsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001136f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136F 17412 bytes
SHA-256: 08432b8082536d78d4a3017c38bd4cbc628b8c196f89da66c06904bd7147c145
font_01_sfnt_off000140e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000158fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158FB 11008 bytes
SHA-256: 09c6b98a402ab6f40a80797ce2e8a4895b02d223047fb3c0d1ec3fbad200bd2b
font_03_sfnt_off00017251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17251 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_04_sfnt_off000187c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187C4 1888 bytes
SHA-256: 668beef521be4fa1b4da676305976ef5dfb01e754aef5f9258e056fa92b2b5ae