Malicious PDF — malware analysis report

Static analysis result for SHA-256 167b8e6814198a6f…

MALICIOUS

PDF

86.7 KB Created: 2021-06-27 11:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a739f5027d93f4b9f7edf5cd4deae878 SHA-1: 89dd14b4ea38a8f7b4e883f419533f57989037a3 SHA-256: 167b8e6814198a6f0662ef7ad92366509be2ea8990ae770e006829b36ee45e4c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ketchas.ru/uplcv?utm_term=hilti+charger+manual PDF link annotation
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf3f657143---81273368667.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c6bf34646---37874152613.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/luwukavizufanawa.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/3142118656.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/4a9e97d2ba435dac7f9dbc2adabbb8cc/dupizazojuvisagemuxi.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/qmpis3k6k9aal2hlq8rqrni67d/45671560287.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/7motcai3luhrv6jqa6jt2k2vmk/tanukaveduwejozil.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d39a2f1d5---likuxudezebivekot.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/bujizupunufitek.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/20233202483.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160746052ebaf3---lobuxajolawojebelogapuj.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/sanirogijugufiketokutij.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/148dd2bf06e95a6f9d48c4f6b120c3fd/40316070871.pdfIn PDF document text
    • http://sciattella.net/images/file/19438828562.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a345c255981---tedemukuwujuto.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/lg8gns91n17rqhddkeish95qoa/97214525365.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/kkl8jkvh926dnhk43ae8solm52/fazimodadika.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/p50qv3756e37eve97cnuugolee/87781816261.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/f05ad65b08f7758606647fa569ddb5a1/93812439009.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/5219366609.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c049366d533---6842155897.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/cma8vi39iof124sik342bg2sk3/52641683711.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_off0000eee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 10480 bytes
SHA-256: de4b6d29f9843e25cfa2c2ec1847fbc67c5a8f8d480fc3bcc973c56d27ec0d98
font_01_sfnt_off0001066e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 17632 bytes
SHA-256: 012dd5f744f64962c1e60da06cdcbc0bf304a6898c84da28be46cb23e8619199
font_02_sfnt_off0001345b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1