Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6661834f39c9a3…

MALICIOUS

PDF

86.3 KB Created: 2021-09-12 00:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f1b78b7063ce9e4def3194c94b694c1 SHA-1: 1a9cf331aec30be86ca9f9837aa4db43a00fb08a SHA-256: 9c6661834f39c9a32898f78fb3e796ce8b12fc226445f7848793d46e02f0f449
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious content or phishing pages.

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://catamma.ru/uplcv?utm_term=what+should+i+do+before+selling+my+android+phone PDF link annotation
    • https://daqing-jewelry.com/uploads/files/202109082353057816.pdfIn PDF document text
    • http://oilspecchem.com/files/pupiwawemomukisomuginudum.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/80422891152.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/74233052501.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/kotezikex.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/2701579f6beb6e709158221596888689/rofuxipojuzab.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/kowupow.pdfIn PDF document text
    • https://granitnet.hu/editor_up/fopekazijave.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/91523134694.pdfIn PDF document text
    • https://recrut.com/files/files/wimigolaxamelopifofebal.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a258419b8---julobajinekabobizevu.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/netojopitakuwuve.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/kafopifi.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d19004d3fb---lirununabupavopa.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/87639059231.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/6892233526.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///32857621539.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357d88b70d6---45666685627.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/buzojewozegi.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613172a4742ad---74496867092.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/powosivilodijigisi.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f40a70a3f4---96252057663.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/32781349943.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/83600799505.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/8266018526.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_off0000ead1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD1 17620 bytes
SHA-256: 8cb8026a85b9b573b2d0cbce6beacd6b9a557f120f0429afb5cf6b7f274e9ed1
font_01_sfnt_off000118e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E4 11292 bytes
SHA-256: cfd9a3b4211fbe6068bed998b6d0d14dd8c34debb6acc3fa67b633ed14902724
font_02_sfnt_off000132d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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