Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51cf7bfe9ad4ca4…

MALICIOUS

PDF

79.0 KB Created: 2021-06-30 08:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00ee23859cf538a444bc504981559dc5 SHA-1: a5071466d8002f221ae602e65730a6415f95d0f9 SHA-256: f51cf7bfe9ad4ca4fa38664773703cae8f77d3de479e8c4526033d1a5a79cd67
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The PDF structure and embedded URLs suggest an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ooo-kenk.ru/userfiles/file/68854191411.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b2636447b7f---84140032353.pdf
    • http://xahscw.com/userfiles/file/nabuwasedanenuxetujofex.pdf
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/tejejapatudanatenasi.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/4v7hnorjhgbs2s9cmv7rrkuac6/33516567465.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/vufawodatev.pdf
    • https://arhometutor.com/userfiles/file/vitavelorodomelorub.pdf
    • http://arunimaflavours.com/userfiles/file/kabajomunapeguviku.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d0293150af1---getuginesifamifor.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/c81568800653aa30ded7f72e33ecbd3b/80197048368.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f39916abe6ef5e5780eae39925a14336/zafofeluj.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077dbedeb71e---25402386061.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7uqp1kklvqmip140ks01f2d8l0/zimosizorowoxatitogipad.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/d302552094cee88080873571b08298f8/nibujil.pdf
    • http://446888.top/userfiles/file/30963542100.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ecvigeqgnmjqf6qq08fpi9i9st/wopoxinawinowotakoli.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf980cc173b---67656384520.pdf
    • http://apsons.eu/files/file/53849543142.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/stvdek3qlo476j58flsscbr2gs/22014993528.pdf
    • http://bhk-aindling.com/userfiles/files/rixigik.pdf
    • http://rzn-house.ru/upload/file/70026772103.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/835886ec7e18a416a85ae3b4da0cc3fe/sezobup.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ab232e75a---xiwekedelatiri.pdf
    • http://www.kickcommerce.com/userfiles/file/92482740843.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ionization+of+acids+and+bases
    • 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_off0000d553.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD553 16792 bytes
font_01_sfnt_off0000ed65.bin
c0e4380a8b69c8c6f3ccefc2d6463059e203feb38d98baa3d6377c4e5615ff0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xED65 16048 bytes
font_02_sfnt_off000116d3.bin
49a10ec6dd1faa2e4986e439cb0cc66e872c20edddfd6de4434478be85459227
pdf-font-stream PDF embedded font (sfnt) at offset 0x116D3 10472 bytes