Malicious PDF — malware analysis report

Static analysis result for SHA-256 c889f4fbd4f4c581…

MALICIOUS

PDF

78.2 KB Created: 2021-09-01 06:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e6a5a0c41ba28a3f7a96c603ce334578 SHA-1: d0b194cffec9620dde839b8592524745e13ba0d6 SHA-256: c889f4fbd4f4c5813915bccb6e93bfa106939ff80a6c4dc6c293502ebecd11fd
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting, indicating an attempt to lure users to malicious sites. The presence of these links suggests the primary attack pattern is to trick users into clicking them, likely leading to phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://abwhopewell.com/uploads/files/gifodebive.pdf In PDF document text
    • http://mutamobilya.com/images_upload/files/41824695076.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/889104740.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b431c84148c---49157725695.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/i7cqnsvjnho7hu1ieuefrqsbfq/97543891603.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/546ba5e52f0c8a2a0c2676764bce7968/23178324931.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/dimawidaxibikix.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/41bb3d42bd7d76afd819bb6cf3638fc9/moxamexinaxiwow.pdfIn PDF document text
    • https://hagepoorter.be/files/files/banozad.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/89422714067.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/vaxetimudedofuvirirepobod.pdfIn PDF document text
    • http://119pump.net/d/files/86749964585.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/56912751621.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/remupexijojaxesoti.pdfIn PDF document text
    • http://aweibel.com/Photo/file/sexizitodokubamuxakale.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/14717530326.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2b3e4b0c7---raxapunola.pdfIn PDF document text
    • https://flyfinz.com/userfiles/files/67745765447.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/zeriw.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/86427993676.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/ad51ddc7b73036f96d4c76e8b4a18371/gejejifan.pdfIn PDF document text
    • http://texmet.pl/userimages/file/25998551580.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/33992477385.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/43160791221.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/91590297707.pdfIn PDF document text
    • http://airfa.it/userfiles/file/26029229195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=drinking+one+gallon+of+water+a+dayPDF 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_off0000c8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C7 19500 bytes
SHA-256: e87b9f7cdb02a0c9403ed09be837746cb0a3be5d34f3a1d6049049e997bc115b
font_01_sfnt_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11300 10652 bytes
SHA-256: aa576bff238ea1d6c884f2f0936c12ca09026dfc89c8a9f51ae4df343cbd368e

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