Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ac498d8606588b…

MALICIOUS

PDF

85.7 KB Created: 2021-07-09 02:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c417021d8d4aad3ae8383ccb5f54cb88 SHA-1: 66b80ce79059856e67fb0b4ea2235e9556a20ca6 SHA-256: a1ac498d8606588b88d64e2d187a33d4a11ed668ad7f0979371adf5064d1917a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains, suggesting it is used to redirect users to phishing pages or download further malware. The presence of multiple external URIs and a link farm structure strongly supports its use in a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://oniceh.ru/uplcv?utm_term=the+illusionists+broadway PDF link annotation
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/bcbde0e68cf58c6312a2bb925367d36a/51825941221.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/gewekibokoxetanekeku.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608caf957680c---24550798810.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d31b35364---57057085992.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948fd2d2030---wajukizodogineril.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/porl3nb1a772s0r17qvkvi8ob7/luvisabeg.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16098b5f8bb218---46096719231.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e9389a883523fd3c058c3f50510ba48e/wubap.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/b34cb814937e3217999f4882e6bdb99f/40102677738.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/dudisinador.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/74722957625.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160772f65b726b---lidobaripigurajakasevol.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210621_570F61556AD2B9AE.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/cca493d065792aa5b9fe0bd6e190a643/9434509592.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160869c299766d---82724410436.pdfIn PDF document text
    • http://kajsanordstrom.com/userfiles/files/vadozewowofezefokalulosi.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2071b9ef71674028c0c7160d391b963/63156474069.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/30704611617.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/93229663998.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55511833274.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/ad32d3918f34e44be48521a74257a705/92168331529.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE894 10748 bytes
SHA-256: 9ac64ad2aaa1b0cc7187838e630bf2a366a25ef34595fa517ae63ac8549900e9
font_01_sfnt_off0001014e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11960 17832 bytes
SHA-256: bec7b60f2e086e657f1e59d47668e899c240085214a1837a3695a34d0f02f0d2

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