Malicious PDF — malware analysis report

Static analysis result for SHA-256 0faa0f91acfa31a9…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 07:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 072de546ba40020000cce36162a40a0b SHA-1: 7af16e97c8d4b827cbfa99086e8615c24adfe1a6 SHA-256: 0faa0f91acfa31a97545300877513f70fdb2bc575e024addb3c3d3a846cf55c1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely to distribute further malware or conduct phishing. The presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://sogelec-eng.com/files/ckfinder/files/zisukudavibenatepuvag.pdf In PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce1f7f3114---49622100284.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/18093062181.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dc93a11db51---kawonedolixaxafu.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/88628684419.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/pokuwax.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/losij.pdfIn PDF document text
    • http://texmet.pl/userimages/file/vuropozofokatunafe.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/52929362382.pdfIn PDF document text
    • http://polkovnik.su/upload/file/tigasafopaboruxijuboxa.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0ece4e063---48133169369.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/tisomude.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/24469114643.pdfIn PDF document text
    • http://sam-global.info/files/file/refimudolapa.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/15868350625.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/78263925731.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/nividu.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/98823526950.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/80856420709.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/973ba9b58f7f110dc3f0dc0fe4c8e690/2345552081.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc24662f1e---59194334439.pdfIn PDF document text
    • https://migger.dk/userimages/file/7950495543.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/puwixomanedafanak.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cf6eef9bb---xexugupizojoxujax.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1cc5b3ebd1e022708059ffffe2a7d2a8/walabedijakaburu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=manual+derecho+penal+parte+especial+buompadrePDF 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_off0000d65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65F 18600 bytes
SHA-256: 0090aa0c0dc819af3345686ac112111d6ba56a8c5921eba68b35357b2bfae511
font_01_sfnt_off000105b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCF 11012 bytes
SHA-256: 081fbad2b9beebf606ef9b69dce26da046d208598e65438a5c89db895a61dad6

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