Malicious PDF — malware analysis report

Static analysis result for SHA-256 f389e0a95821369f…

MALICIOUS

PDF

72.5 KB Created: 2021-09-11 13:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d4794ee5a8c58febc31f455acc1b6d89 SHA-1: 4d8c63af8d4d8c4c4cd44d0b729fcaf29588db8d SHA-256: f389e0a95821369f40662d1376133558c704350af38719d4de813ead4c1064de
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a link farm pointing to compromised CMS upload storage, a common tactic for hosting malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130404c754f2---xitexejarufobironawese.pdf In PDF document text
    • http://meadescafe.com/userfiles/file/6909614172.pdfIn PDF document text
    • https://fuoriscena.eu/file/vexixinujezowanutidu.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/25466974111.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/28238838380.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/71936893488.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/galaful.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/kiwowiwotuguwulatuxiv.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090302095975.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/45284698675.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/22536179928.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/92087586020.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/38978633852.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/veliporedumivi.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/42190950262.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/wowoxevazipavufiri.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/sokojewafipalaxoxifatefi.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a267eabf65---xuluxavaxekodilogogul.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/45568717853.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/luzoroxa.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210902064914_72411819.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/bumifor.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/58023362429.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/bd8af1a81f1d7962b2ebfbdbd44c809d/jevowogewe.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/bikatuxikaporifoj.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/8418268738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=now+you+see+me+1+castPDF 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_off0000b803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD015 17352 bytes
SHA-256: bf5128a3ec6badedab8f539dd80d0d6a12329bfaeb1cca2c4bd890bc203d2a8e
font_02_sfnt_off0000fcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBF 10380 bytes
SHA-256: de404319ad7b50a65a7722b20eb7a83c0317e2a622347bdacd2172948568722c

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