Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a25d4194e72908…

MALICIOUS

PDF

114.2 KB Created: 2021-06-26 21:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: eb971917b35534a4eec695d4ef8820ad SHA-1: d3521efc73ad0f117d33f2efd4dba46c3f25f183 SHA-256: b1a25d4194e72908db0a2989e5c2d28557b571e66dd67b6fd08fbc736d2367bb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9859

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/25akrtl9nbejivbqtlg8u2a6c7/dipufopenemosifobokoxeba.pdf In PDF document text
    • http://mwflower.com/upimagesfile///26475305776.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160832b958ca24---madenosefarojitu.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60a1240040---kugisu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7vhjejngo23vjc36q33fh2oak2/39361625479.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5fafb6445eb21a279fb594f514cd88de/93157780966.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/hstn2ijh499jn6bfm8f812thgp/zoluwupogusuwokepulalojo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920ddf5fb00---23841634009.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5f386a210---14152863707.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080db0c1aabb---60487058518.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607043bbf0aa6---66137585415.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd698eb05d2---dugusojovimawiraxobewuw.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abb66252b28---getovejakeze.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/5auo305rko9t6n8uo1jbiluo98/37890659775.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/93437407442.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/04062ec84408eda6c07aded8d4661115/57852370967.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088756594e39---43018083410.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/2527005844.pdfIn PDF document text
    • https://service-panev.com/userfiles/3899399154.pdfIn PDF document text
    • http://marymo.ru/uploads/files/siwerejamogaxeketubofuwi.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d605aff7c---29616394214.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/eqno2cesco0l3vibodhbsjruj3/80156302660.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/66207041674.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021061803302919.pdfIn PDF document text
    • http://93564497.com/userfiles/devomanopubelogivitur.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/65234995253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+meaning+of+dignifiedPDF 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_off000156a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156A6 21680 bytes
SHA-256: 3efadb0f2d107cff7d4eb3907b3d7d325a497364daf90502ea60b7b2e7e3f5a8
font_01_sfnt_off00018cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CC5 10352 bytes
SHA-256: 29da464b689ef5973d96b2e0bcc803ecebde2573017d5b61fc53e9db491bf705
font_02_sfnt_off0001a3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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