Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25648d269c9a1d0…

MALICIOUS

PDF

89.2 KB Created: 2021-06-28 03:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c47126c0ee9ff5e0a1a4c14b5b71b2f SHA-1: 8b73358b548b4baeaf9f89546dc96702089f606e SHA-256: c25648d269c9a1d0adf16e98fe6ac3c5cab581b24a94fb8bfb1897b8361092f3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, distributing links across multiple compromised CMS uploads and disposable hosting sites. While no scripts were extracted, the primary attack pattern involves luring users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://jfhconsultancy.nl/userfiles/files/86531602854.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e53d4d98bc---xokugavora.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/0f7c1d232ad4f36a6c27d98a0391c4b6/xefepufux.pdf
    • http://innovad-ltd.com/userfiles/file/7208686018.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/8871f5f0f53a068678be2590d3b1e9ab/31339763142.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b908f425d12---91185475905.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/68d117bbec86493b03a10922a205ccff/todopowopida.pdf
    • https://angkalaris.com/contents//files/5098216058.pdf
    • https://mttrasportisrl.it/dati/upload/file/76830228318.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5572536d5ab029b7a6302e7e50516901/buzevuvemoregeliruximisu.pdf
    • http://sys-svinding.dk/userfiles/file/15470855482.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/m249kkhviakovi72eatfe80qb2/47491051888.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/88i4akaa15vquqb6smbo17tta5/98938579055.pdf
    • https://rybczewice.pl/userfiles/file/29183751003.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/jcshntm3il88ft61il15ohnsj8/nojovutusuti.pdf
    • https://nmcs.ca/userfiles/files/24638383176.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/93550875909.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4992e4233---52549471212.pdf
    • http://e-cluny.cz/UserFiles/file/zimimuregovasim.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a175f1491---64264239183.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608be7f31f1df---85948275575.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa5b1bc45aff029038a5d5acf7d8902f/geterizeragojunageriju.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160812ddfe45e7---vavukorolaviwiwifuramuzow.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+yellow+who+can+learn+flash
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edbc.bin
6eb9828dadb82d2dfca80197e82bbddeea6e874b6ff50b72af317f87883b7d8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBC 10704 bytes
font_01_sfnt_off00010632.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10632 16792 bytes
font_02_sfnt_off00011e3f.bin
5b9e8a16225a7206870a64c2abc63f4e812f7548e27df88d04605fb714ce6253		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3F 2080 bytes
font_03_sfnt_off000127b5.bin
3518c77936b57228723213b8192c2022775d660d98544504dce68b26fcd96211		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127B5 17596 bytes

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