Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9a1310a22768a1…

MALICIOUS

PDF

98.9 KB Created: 2021-09-07 00:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dfd73059adc74f04de354848ccb757d6 SHA-1: 9c84af1665b2a965880303b4ffa2d412371fcd03 SHA-256: 8f9a1310a22768a1318f11dc037b5be2dc34460fa8b31983ab5f9276ce19c840
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://queure.ru/uplcv?utm_term=reflexology+handbook+pdf PDF link annotation
    • http://lse.hu/userfiles/file/2116134803.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/farezikoxakelemivu.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/wozowo.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/8jha3fjm9b5mem0qi9lq7ad0b1/xosus.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/ragopadesid.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/lelakowipifodigo.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/55174002633.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba6cd88bd8---magugesate.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/42100265208.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/lofipabevesifepaxegapu.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210812_05F2BA7A49B29177.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e007d23773---fufipob.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/5066407234.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/nerofazidukasexoro.pdfIn PDF document text
    • https://auto826.com/uploads/files/mewegufotupo.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5681bd9bc5---56098007736.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6ee559993091cf9309ed8f142e5a8258/muzavup.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/4d2654a83d4e4609949b85d06b9c6891/87664531908.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73f68fded---75520621985.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/48678555882.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b90f6ebcb3e---viwojewilal.pdfIn PDF document text
    • http://usmleworkout.com/files/file/tarak.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/67826012315.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/8accb9d36258809c9e972df6e17585e0/43252835990.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/jebelabodupesanefo.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/25524015295.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_off00011db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB4 18464 bytes
SHA-256: b9cff550763c81579700ef882521f29f1520d40cd2816eb0879ae5b2f9d986d2
font_01_sfnt_off00014d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D99 10812 bytes
SHA-256: 5dff55d3e080bf8a9f4e7d6e7ac0451ac5fc8e1d5d36fe6ef202a3ad962d2206
font_02_sfnt_off00016615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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