Malicious PDF — malware analysis report

Static analysis result for SHA-256 af08b32277ee9d18…

MALICIOUS

PDF

78.0 KB Created: 2021-09-01 15:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f33f9389d75f9eae712fe975d8bf357a SHA-1: 08fcb5ee2359e4076baaf96d79595283b6d98236 SHA-256: af08b32277ee9d180e94bccfd9e57bd27b957769253c31530df872e96d049315
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 sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=caribbean+sociology+introductory+readings+pdf PDF link annotation
    • https://langestrand.se/anvandarbilder/204/files/xotobujobavawojonojozomab.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/17416537629.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/49241831536.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/kukabomasesajadigutudir.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/redes.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/ascpn93ecs6t941doeohglsbq4/23376306601.pdfIn PDF document text
    • https://educhina.mn/editor/files/zakuzitepesozanawu.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/movilidafeje.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/6243185034.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d29efc901d057dd3a361af587568a7c6/15820471342.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/panesefasuri.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/218451df9db468dcc501342ba734d3bf/41255246103.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129cbf0c8a5d---kokenisanafabatupawivi.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2af314bfb---12969078934.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/litisulimazowobatezo.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099c5d38fb1a---wixafowazipapokedizoj.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/12240968677.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/roxirusagoxazutodekex.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/bobip.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/fafefobapepojesude.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/dc72dbf963582b18a5297bedb5c8a8ab/86967304118.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0747a9727---kawirudagevamojokuwifolik.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/mabuwixiwugopakosexofab.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FF 11180 bytes
SHA-256: 2af02197e13f60b47b6cc26e4a8a748a942201c22f55a2092d89d5130c795f17
font_02_sfnt_off0000fee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE6 16564 bytes
SHA-256: 73fd42404adab5f62da1e7ae428ae6fb494547dc077a20ddcbc9378d00aed282

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