Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ecb02a6050eb88…

MALICIOUS

PDF

86.2 KB Created: 2021-09-01 10:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4c9fb3d7fc991777aec449fa7a908cac SHA-1: 25dcd2fc1bc360e37fa7a33fec768168635827e8 SHA-256: f8ecb02a6050eb8869562510ad3b8c24d88d05685f83b14379cdd288bf1d9cf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://crysiq.ru/uplcv?utm_term=orthogonal+functions+examples PDF link annotation
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af7cd3cc7dc---72718574514.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/01359b553ede34ce4696c05424b6b81c/tuvevarinoxifipuwarifumo.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/gilubotolarafof.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/zitatovisazuvipur.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/tofifisozixi.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/vowek.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/xadam.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/69891977894.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/2642622024.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/74683350274.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/toliwufeb.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/podunigowaxegobom.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebe54d199e---lusoneketasu.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/xegezizogusakirefada.pdfIn PDF document text
    • https://angkalaris.com/contents//files/17521468986.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/29211147202.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/fut0ek0e3m5om2ecut7i75jr1l/74325306316.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/17950423623.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/66007498051.pdfIn PDF document text
    • http://thedreams.cz/files/jogelezikupa.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160fa5b9fdc9a9---10086077126.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c530c6b3bdb---17544454113.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/85571319141.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/rejodik.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ab0cdb51---74929772466.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/3483942342.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 17924 bytes
SHA-256: f268e40712251f9194077969139ca5d18ab7b439eb339d5043c7dac075bd5cfb
font_01_sfnt_off0001191a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191A 11156 bytes
SHA-256: 6e3bbefe8f47eb33908d5ed1bb7badcf596a40ed7c4689a7f7c27669ee4d950e
font_02_sfnt_off00013317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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