Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c088f45b6beeabf…

MALICIOUS

PDF

103.6 KB Created: 2021-09-04 04:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 99385ee3f8b58e1642692c677cab6781 SHA-1: 2ec8f4cc8f3f9963e39bf70d2e55c9975870a29b SHA-256: 0c088f45b6beeabf99253499d2ec600dfe5f64ccf0b6532148a94f66bc3cffb8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=criminologia+clinica+contemporanea+pdf PDF link annotation
    • http://bezagsecurity.cz/userfiles/10601624978.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/98849404980.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b98c8cce56c---9904803472.pdfIn PDF document text
    • https://rajaunited.com/contents//files/94012231917.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077307ac0ea1---tinumemidalowofojufin.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/15310885751.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160739f5f3ddb4---bawojosetadibofenojalus.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/no5arh05uht5qspg7b8mu6ved5/kilebisi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/90245976257.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/5f1f1760e54e7ae91edd5322b8df9cfe/faperawateze.pdfIn PDF document text
    • https://tipresentoio.it/images/file/72411825513.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/tn4c56e9h58rerll8fg24irf91/miwijo.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f465ea42dc---momapotijodaxuduwufig.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/dc4a41294c61afad6ecdb21f4ee76bdc/fowivusidawefanijurezi.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ddf0adf21d---rumiwelilutel.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/fobuweluvatobewezapel.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/27708126493.pdfIn PDF document text
    • http://sassyissy.com/survey/userfiles/files/22697485069.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b206d5841e---41970659370.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/87561243279.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/15546858898.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_off00012d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D98 10824 bytes
SHA-256: dcd6144a17bd64c2c3eba1b196fe95597a9fb1e7056f30230efa7359ea5d17bd
font_01_sfnt_off00014650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14650 19380 bytes
SHA-256: 66b49fd1f92ebeeb818bac012a339c732489cd8fa3be92ce0f658ad35bc5b239
font_02_sfnt_off00017893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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