Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f520e0786e7160…

MALICIOUS

PDF

103.5 KB Created: 2021-08-01 19:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: ae65824451c403f92d6f1bc6f26db0a8 SHA-1: 562f6b66f2c558a125d998746f5ddcc53b4b4fce SHA-256: e6f520e0786e7160eccc9bcd9ee56b6383a0138d60283ab7baa5d34eb862202d
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 CMS uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the exploitation of user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://irinaburmistrova.ru/files/19971996859.pdf In PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609478ff81d0e---lapadekekuwojujobevorela.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/4pajj8admrrs5o86p7mvru0d25/bovatekeruj.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7ae892377---62801222164.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/79109781064.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/e8ba067fc8f8dfa2a821d4f48d413c4e/64836383064.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/pixofexofajabelerir.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9455cce242---11523204693.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/vetofibozax.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16085743456dc4---xavoxinoboxipo.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/8148025972.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1fi05rlobl21p7klt1djuh07p0/badalaxukosaroweloron.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/jibanoxudemufapoxegika.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/kajoforokov.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/dejogenigifodizokon.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/23830390231.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e894b9222e---66218538265.pdfIn PDF document text
    • http://giwajib.com/data/editor/file/jexabunenixonafikaja.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608f13a70e4e0---22448586012.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/jupemuzera.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/49251643911.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/0jau6ku9rtr7tq548j7ai8klb4/muwubedojibesinuxeve.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160901215d7b8f---5833223711.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/98196633136.pdfIn PDF document text
    • http://bwc.lt/i/xerowupobisavaditi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=lifetime+54+legend+in-ground+basketball+hoop+reviewsPDF 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_off00012eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB7 11632 bytes
SHA-256: 5a33b75a522d6d0b9b1f83c5d913ec70ad884095a023882dc1d01a0356f2eda9
font_01_sfnt_off000149e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E4 17300 bytes
SHA-256: 30f6cbf357f7cb51a26c04502dfcd96172a946edc4fad9560c7760a9545f4bcc
font_02_sfnt_off000176ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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