Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd7288ac6d8cb38…

MALICIOUS

PDF

73.1 KB Created: 2021-10-02 00:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 63efbae126f00ce3fbfaf64b7c640bb0 SHA-1: 500da27b552fe33c818298b5c020642673a39d78 SHA-256: 0fd7288ac6d8cb38600dd8bf25587d49b6c24af5bb5de9533fc8ce4fe510b6ea
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS upload storage. The presence of numerous URLs, many with 'utm_term' parameters, suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crewmak.ru/uplcv?utm_term=install+one+ui+2.5 PDF link annotation
    • http://homeshopeez.com/uploaded_files/userfiles/files/42030591489.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210906065059.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/dubamejerugovizujepujikav.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/tezokizawerosi.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/tugejokafazenawiw.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/pokigubuwarofuwusevib.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/59629904648.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/27621687175.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/vumugizadujewekiwezodij.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/30083138770.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/munixomeruvusafimanapi.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161318c9bd91c6---89647274967.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16150106a28e48---fisox.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/tofadijag.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/19447462035.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/likozirepalabufotidugex.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/69265471868.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/0410eca704913fd40c96e69ad40b5ea7/duxakasirusukodojo.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4bf55f0fa445eb9163411b24b222997f/bikixofozud.pdfIn PDF document text
    • http://licausi.it/userfiles/files/deverawexusezexadojosura.pdfIn PDF document text
    • https://gulamanis.com/contents/files/pipavalaragifekew.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/64720325860.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/84458006995.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/gewunileromip.pdfIn PDF document text
    • 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_off0000b658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB658 10372 bytes
SHA-256: b3db2f3fd4a920e46fd674e6fce0970aa506a4fb5bd2f2043aa22e7973e5a946
font_01_sfnt_off0000ce03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 18280 bytes
SHA-256: 292c0a644ea58fc629f2bd896df9961e625974ffad725ae3fd93f66f44d81cf6

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