Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4f7d4ba2a9c360…

MALICIOUS

PDF

92.9 KB Created: 2021-09-08 17:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ffde5d6269617f1535d2c9578f873f32 SHA-1: 5b1274a3149094c59540566f5eb9fabae0dda4c0 SHA-256: aa4f7d4ba2a9c36029bd25d62bc292ed59e21b3a38f59ee4ec676794c883ba4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads, suggesting an attempt to distribute further malicious content or phish users. No scripts were extracted, but the structure and URLs strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132838567f90---nebisivexakanafikarar.pdf In PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/73959885361.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613685052249d---kilunuxubaxupuresuregaki.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/sugirofagibibujemar.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/juburirok.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/2d2d82f1076a25d3f379548852ba1b04/57678142645.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/13338719732.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/7c174ba5135eb117bced4f9e153fd6a8/muzejemi.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/24671924068.pdfIn PDF document text
    • https://termoformat.md/img/files/14978417571.pdfIn PDF document text
    • http://newshop.jp/archive/file/zutefiwalifirefuli.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/h85v2q0m1c132t6jd7b90japnp/81370339509.pdfIn PDF document text
    • http://njxinbell.com/upload/files/6905743483.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/19811394865.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/jexutukukikonuxupab.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/17776022041.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/99918380853.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/pososomonidapanurixebuvi.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/16586259293.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613861c70f3bf---fozizonekakosuremezola.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/97680182933.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/42117070579.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210905011742623.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/41121805314.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/77743545880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=journaux+algeriens+aujourd%27hui+en+pdfPDF 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_off00010036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 20996 bytes
SHA-256: a01b0ea7fc40cd71cf0316c7b730b7583c5dc5add8531b322f5cd8a701e5a432
font_01_sfnt_off0001342e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342E 11036 bytes
SHA-256: d632defbd5b404f8245aa96dce9f749b9dae48465bf7cb0881400846eafa9a5e
font_02_sfnt_off00014d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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