Malicious PDF — malware analysis report

Static analysis result for SHA-256 d986f35d8a39db0e…

MALICIOUS

PDF

84.7 KB Created: 2021-08-01 02:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5167187f954c602e99089f9b683e2995 SHA-1: 59368f13c21f76028d05244ba8e752d01036b8e4 SHA-256: d986f35d8a39db0e7867474b28985ea4b69870b0883c20cf51f96f0f0a63f10d
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malicious content or phish users. The presence of external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ketchas.ru/uplcv?utm_term=how+do+you+animate+stick+figures
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe9b590668e---61877623291.pdf
    • http://www.peretprod.ro/content-images/file/83116202012.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a422c980804---94154177882.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a7710e9f831---58361995924.pdf
    • https://luminex.pl/upload/file/gokazugakemubifibe.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160adc3fccc0e0---leboketinuzotixezagif.pdf
    • https://nhahangphongcanh.com/uploads/files/6935370746.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/i0qivmbdi2e0k4erjpfcaqpp96/kaponujodikopegugu.pdf
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/37413922926.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb7c290c9---24515667757.pdf
    • https://ncvpte.in/userfiles/file/jefutorok.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d758511fca---naxibedirufiganu.pdf
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/27319609516.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cb143e340---xarudotadad.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d56b600706a---birijesam.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c03a48b37---41175322744.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/65015bbfb619393f72e8ed66f18caddc/lemagejeruxopetamepaxodig.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a723a669199---39063887243.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4694e3e8be---26458196099.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825ba15b8b6---10897822694.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ba2fa7075---bijekupokaxaj.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f3bdd140b54---jifolipu.pdf
    • https://isosklo.cz/uploads/78338560267.pdf
    • https://lawina-radom.pl/files/file/78504163608.pdf
    • http://broadmoor80.com/clients/866172/File/69723977204.pdf
    • 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_off0000e74f.bin
1902a4a3c740f5baae8927b95c97a7f5e19778f063d3449a4e18b1ac60a1f46f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 16752 bytes
font_01_sfnt_off0001127d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 16792 bytes
font_02_sfnt_off00012a94.bin
7a5a0c381ed5f50a22f81d4e861f13ef7e8269d161ea68c9bd3ad945420adaf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A94 11156 bytes

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