Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c2e40bb4fa99d7…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 13:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aaf47d06ec4996be860b85014e2b881f SHA-1: 72025eb83d640d95163ce80574238156d698fd75 SHA-256: b1c2e40bb4fa99d73bd8a676edd8aca082f2721ad5ce0de2794368036e02ee43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection further confirms its malicious nature, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://jahanchart.ir/data/files/file/21974194235.pdf In PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/mubade.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba473d1e0ce---nexorudowolarozijej.pdfIn PDF document text
    • https://vpmemorial.net/images/file/jokuvewudupakaz.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202108020430533885.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/iilhejt957pk0tb87b9di3ukvd/genaxanabader.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d45bef7c4---68875129442.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/lijedatarofebogamiwixini.pdfIn PDF document text
    • http://teraval.cz/res/file/wosoxawogezazug.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bed3c8cef60---84401596793.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/42768505991.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16072117938089---26799230329.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/c097a240281f8a5f8198f315460c0625/boxapo.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/furimudoruwenodu.pdfIn PDF document text
    • https://serka.com/serka/upload/files/dotizolumawuzo.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b397c02a67d---30531113548.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/tivikigelof.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/1osfp9d87i6v33guk6h3ii61q2/24709168335.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/vudujunomi.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/16473992351.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/ruxadufowezilizifukizo.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/tuninotopirulajazanil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=prudential+life+insurance+beneficiary+change+form+pdfPDF 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_off0000dc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC47 17384 bytes
SHA-256: 0b93a920edead85d171ba86eee8fa3ca69d3b5cbf381a373cf1d54e5c17a21ad
font_01_sfnt_off00010912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10912 11424 bytes
SHA-256: 1a6ef1226b0f1f5b9a710abe24ef468eb2e3f2f5f9514e52cff1df130db907ff
font_02_sfnt_off00012375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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