Malicious PDF — malware analysis report

Static analysis result for SHA-256 326d62d91f056d09…

MALICIOUS

PDF

77.2 KB Created: 2021-09-08 20:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c9f46cf3d49580bb8cabef1cbf9a06c SHA-1: 01ec1f0d88ad5f375b42dfa6e0dfa4999d2ae7fb SHA-256: 326d62d91f056d09ad1f37654c35d0b8c3645739eb1b000ac71c333a3b010774
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is used to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://hygradeinsulators.com/images/uploads/file/samasusas.pdf In PDF document text
    • http://pzhjintai.com/upload/files/mopaxegojonefamevam.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c5407e417---pawizo.pdfIn PDF document text
    • http://freewest.at/61825076891.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/32489380220.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/8535262854.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/xekudelemediwofekob.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/kofatopul.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/74882019335.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109010630545966.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/lebozobomat.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/12517716335.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/lofiwiwamotazizasuru.pdfIn PDF document text
    • http://boldogelet.hu/media/37553956829.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/84648542406.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/64680727291.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/176987356.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137b5a0e286e---38311461298.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/56nbfceho2uf80monljmopl84p/befudadatifekemaxota.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/xizopetibufesitanefudisan.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/34164421086.pdfIn PDF document text
    • https://glozor.com/userfiles/file/palefomatonovosazafuda.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/motogademirumun.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/badojirovubererira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=commutative+property+of+multiplication+worksheets+3rd+gradePDF 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_off0000c43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43D 11728 bytes
SHA-256: 20174e86e4a7ec570222cf52191aa4ceb41c00e504862bf9231912c5edbbe21d
font_01_sfnt_off0000dff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 17976 bytes
SHA-256: 0e966a382156b3cf3d388ce00f1ad7bfb63b3f1a88bbaf6cad5a13f775d2253a

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