Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5e55ef8e732910…

MALICIOUS

PDF

92.7 KB Created: 2021-09-13 13:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 915755b333138412ed6abf373c1de50d SHA-1: ad096c69dc7ab406d00d2c69a9521a052d3de286 SHA-256: 4c5e55ef8e732910e23c150eb14aa0f1133b7aae843fb1b536cc2f1ecb064ef7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links are likely designed to redirect users to malicious sites or download further malware, fitting a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://transilvaniafishing.ro/app/webroot/files/userfiles/files/tunevaso.pdf In PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132362d0a344---teluwupupatuzu.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/mapujosivu.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/kimisopofojebaxosuvug.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/tosurepu.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/puzipos.pdfIn PDF document text
    • https://activepymes.com/pub/file/kizidibeluzi.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/pibujasume.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/kudegasoxugesokuniz.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/naxaforu.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/78007855994.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/kasilewidof.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/50018317765.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/r17cstktrvoc33rrnjvr8mh7cs/xazudoremo.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/12768683878.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/44006133157.pdfIn PDF document text
    • http://centronegozi.com/public/91123096934.pdfIn PDF document text
    • https://frisch.ro/files/file/93259206333.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109040651362790.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/pukajeje.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109030757349124.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/88736612037.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/jaduputasebopivox.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/577907368.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/43u5u7rmc006fljb6sqh0fo002/19378880934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=my+gospel+lyricsPDF 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_off00010499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10499 10292 bytes
SHA-256: 9d9dbbd0a6cd26394e678b87eae65318c0f5d49afd9c45bdca33eac8b8348363
font_01_sfnt_off00011bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDE 19140 bytes
SHA-256: 490bacda5b64e87e6ccad958aba4b13f1f00e009ea7f332048522703381be90f
font_02_sfnt_off00014d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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