Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87f1d66ce175e9d…

MALICIOUS

PDF

83.6 KB Created: 2021-10-11 01:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6b066bed93bb913cb35ac365f584141 SHA-1: 1a3e4b123c21ac1995c237c88b16d8cb3e8932bc SHA-256: d87f1d66ce175e9dce7cfc0d316a7a592cce3594af0159a71646fb51c0764d77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on compromised websites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mayphotocopydogia.com/upload/files/22832171349.pdf
    • http://shopcloud.cloud/ckfinder/userfiles/files/43185560940.pdf
    • https://accessnepal.org/userfiles/file/50377981550.pdf
    • http://vmkmsz.hu/userfiles/file/38298757679.pdf
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/48896582488.pdf
    • http://dooroc.com/tk/upload/file/tamevuwuxaragiwamejeluxe.pdf
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/78753493123.pdf
    • https://gryf-wet.pl/ckfinder/userfiles/files/pisexobasureda.pdf
    • http://wamer.org/userfiles/file/75041425307.pdf
    • http://deaprogettazioni.it/userfiles/files/8746149571.pdf
    • http://sun-apartments.pl/data/pages/lifovewoditab.pdf
    • http://tasarimak.com/ckfinder/userfiles/files/vurokawizolewanovajoj.pdf
    • https://horacebatten.com/ckfinder/userfiles/files/58857886195.pdf
    • http://fulico.com/v15/Upload/file/20219251226507701.pdf
    • https://saikekanglun.com/filespath/files/20210911185348.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/7742fe570f39df6391ee27411c2b9aea/49425439604.pdf
    • https://sklepbonus.pl/userfiles/file/jatatalomapuguwiketede.pdf
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/gobev.pdf
    • https://braus.uz/images/shared/file/juduf.pdf
    • https://easy2ticket.com/upload/files/32217074061.pdf
    • http://amindoost.ir/images/upload/files/12432702010.pdf
    • https://akproauto.net/nbloom/fckuploads/file/nirazaruvezu.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1c511e14a---73834292279.pdf
    • https://loonbedrijfschimmel.nl/userfiles/files/kutopiwuvalover.pdf
    • https://fainitelecommunication.com/public/editorfiles/file/53626016004.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/a173f9b7238fbc46f3df01a9d6ad1a14/xuvanaburivunakozanu.pdf
    • http://neogmbh.de/www/sites/default/files/userfiles/file/62468112679.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+build+an+elevator+in+minecraft+bedrock
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000def9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF9 16792 bytes
font_01_sfnt_off0000f70b.bin
b869eb9a29bd8400fb9bf6f5a20829762d9d11cd73cb14ddb1f463da85ac2a09
pdf-font-stream PDF embedded font (sfnt) at offset 0xF70B 18612 bytes
font_02_sfnt_off00012661.bin
3e2de8015cd543d78b4e966b7d72dd88d5ce621de90091660c01791491e1f03c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12661 10944 bytes