Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4cac2f046b9b83…

MALICIOUS

PDF

86.1 KB Created: 2021-09-15 04:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 61374cc0cebfb2265ad121c1652ea9ac SHA-1: 85b0f0a63ee127a496b91bc99c9046aa114ec35f SHA-256: 3b4cac2f046b9b834af622f6d4d590aead9484f55baabebe50167606d18dcf2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=gta+games+for+android+phone PDF link annotation
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1c175675d---65266632339.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161411265921b4---kekefurogomabe.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/48096409049.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/gelaxoxajuxovemufepik.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/74985555818.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/poxisedapezagogop.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1630899440.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/37062453436.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-9/20210909224926173797.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/mifemawe.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/tizufe.pdfIn PDF document text
    • http://exosushi.com/uploads/files/75835411066.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6abc37111---87086100006.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/lomupovalutusa.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/kutiwod.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/22030302643.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614127e1789ce---2656795926.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/supexasanimowam.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614138a259bfe---zolip.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/66172503428.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/xadalo.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b61a4d06a946e53aa81dcedb8be84388/zugexafuzowiwasugon.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/giwofirenim.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/29288388448.pdfIn PDF document text
    • http://ladna.pl/user_images/file/musakoviwa.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_off0000eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 10936 bytes
SHA-256: dc0b990f13eabf423b803e78a3f0f9e5682df18f39658790861284039a6c8e18
font_01_sfnt_off00010493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10493 17620 bytes
SHA-256: 394cce1ebf8914a103320cd054e97d81df1463854c5db10c9a2be93202e56da0
font_02_sfnt_off000132a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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