Malicious PDF — malware analysis report

Static analysis result for SHA-256 0884188ce01e8009…

MALICIOUS

PDF

87.3 KB Created: 2021-09-11 03:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1524c6a4cdd0bdf0e9f142321f45a5d5 SHA-1: c8aea087edc5e29c19ddf12fbd8a500fd9e56d39 SHA-256: 0884188ce01e8009e3b6ae545c6228342d24af9ba1ea2e13ab42d39fdf615804
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these link farms suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.ambatownship.com/ckfinder/userfiles/files/76249522998.pdf In PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecc94497cd---14595310130.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/26783465103.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/tifadugupakot.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b80617fe77---tinubawiwi.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/86369279234.pdfIn PDF document text
    • http://greenbrier101.com/userimages/fozubipuxipojiguset.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/minobubofanedi.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/15142888039.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/20433338968.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/70379044860.pdfIn PDF document text
    • https://kiptep.ru/file/lafupisuzulobazominut.pdfIn PDF document text
    • https://digireg.pl/upload/75566393133.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/bokilulemevujufuje.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/16678071579.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/38975151005.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16136f61c5e18c---22280364904.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/zodupukiv.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/42110247262.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/fn8r3pkmk975ss75ahsegdf919/rodidufarejivov.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/33533821023.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/51812414334.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/97502721499.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/26730251459.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/vifoviligatoxutuxiju.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/pixakojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=no+internet+required+games+for+androidPDF 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_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 16752 bytes
SHA-256: cdc9bf025e81c8f4bcdb25271b1f2f737075936bba436b0eaf52468cb0ba8132
font_01_sfnt_off00011e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A8 10872 bytes
SHA-256: fb9236f8d864e731af7ff579696d62d85a6bd8dbd368cadba03bf9007d4c0e46