Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e9d7fbba5faaa7…

MALICIOUS

PDF

92.1 KB Created: 2021-07-19 18:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0e85b3a889e732a9333ac4f60ac68e6a SHA-1: d379659bbf382bee8a8b1fe9d817de39d52ac0b6 SHA-256: d0e9d7fbba5faaa79afc1282300692597fd15ecec207002f413bbec79b28640f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous other PDF files, many hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://ckpak.com/fckeditor/userfiles/file/sababujogunozekudup.pdf In PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/loruxodar.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/5419409210.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7592399376---61590819668.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/jupewukesitikikiraje.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/27508314980.pdfIn PDF document text
    • https://chp-travel.ir/data/file/nijesepitabutejebilesad.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073712ee74f4---kowupudokawonisixuronuxuw.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c246759205---12548448564.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1961af1a15---zubuw.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/cb4370ebac60e225db85922b097c937b/28001867884.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/8gbgfsaq5qpgagd8h3jat205l3/rinirujal.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/66103247204.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b04cbb03460---93488932689.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/sugafakeropaviroxoki.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e45ae5f64---negijufakimoxu.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/39757108360.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b1a936e1f---78615689441.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/8dd81931c9bf82361b04f6f007682f9b/33223363286.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/95306859995.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/22298640501.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/78939520388.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/3446034437.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/d48204f5bb4dc9949030be151f0ebe3f/64417140168.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/45237730740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+basketball+diaries+book+by+jim+carrollPDF 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_off000102fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FE 10968 bytes
SHA-256: e3127db9f26821eafc5ef5938df55183d12c5f3683dc5512e87a994e00392e9f
font_01_sfnt_off00011c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C78 17864 bytes
SHA-256: 82c82f816225ac0c86bfc6c400ff8456d96d5d28359a9fe6070a8d7766682e0f
font_02_sfnt_off00014af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1