Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53b3678c851a757…

MALICIOUS

PDF

81.2 KB Created: 2021-09-04 11:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a3d3b158e59c1243e0dfd8f5e134d466 SHA-1: 755aed128b02f5ba7fd7f7d2ff500a4b75a5a98f SHA-256: e53b3678c851a757109fbf2bda73ad7c83071f3666e0c8dec6ce70decfd287cc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations and other disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The document body is heavily obfuscated and does not provide direct user-facing content, but the heuristic firings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080b82853ee0---vogegozukanuwogomosamana.pdf In PDF document text
    • http://ronaldtan.nl/images/photo/56460812145.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a1793b22e64---sedolomagepadadawigevolux.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/84766828422.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/69431909681.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/23f32d832dc4ed5880049706a6e8d09c/98130182091.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/5073281334.pdfIn PDF document text
    • https://kaimano.it/file/kukokozujupida.pdfIn PDF document text
    • http://simoncaulkin.com/images/korujiwuniwarokixupe.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878c4d5e795---latibejupojegobojax.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/nawezonixafanipemisa.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/ginugigesaviw.pdfIn PDF document text
    • http://sjhtractor.com/d/files/bekaridafogezijoba.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161123bc3dd21b---xizapasuxifafitanumo.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/sumox.pdfIn PDF document text
    • http://grupophi.es/uploads/files/48713352595.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/lolosunazof.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/xepovix.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/kabifewapevigejeta.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7476d1f873---39722127374.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/nujoke.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/91541429dfd70e5fdc8b52febc8881b3/jafofetaxolinisuxizorozab.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/17825116040.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///zonigulera.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/jajagiredewadow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=halving+numbers+worksheet+year+1PDF 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_off0000d5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A2 18392 bytes
SHA-256: d32debc94676f12058cb6ab2e8bff646e45275b456715c228e440bcddcb23481
font_01_sfnt_off0001045a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C71 11196 bytes
SHA-256: e8b0a237f5c7176d9f61e4b7f357423114053773a40f36e5ed88c20c8515cdee

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