Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bd29e0743e0778…

MALICIOUS

PDF

87.4 KB Created: 2021-07-07 11:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c7b9804c5d960451feb811572ee258e SHA-1: 42d70f1723ced3962a1ca398b80dd3c961cfd8e9 SHA-256: 77bd29e0743e0778f2cb61dc0bd4fb9198b7012d0c5fe9991d9ba6a17d68d711
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm or phishing lure. The PDF structure itself is also flagged for containing external URIs and potentially being a link farm, which is a common tactic for distributing malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dee88f0785---95636952945.pdf In PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60B24A23025AC.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a562d30bdda---88454187044.pdfIn PDF document text
    • http://promador.pl/userfiles/file/17716941967.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c89d17bfaa1---geleranawep.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16084896a8ccad---pobaxuxoxuzorot.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855cbc83ab2---55382610035.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609695f90e1d6---65537203922.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/07cfd141b2c51adece6656eb2a7ed301/vulutinoxiza.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1a7b4684b---61825340185.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/42599197716.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/u3fslavvv4g6vinvq3cevlma70/nipugejudotoladalug.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/5n3k7bot2rr6djba67pq9305pq/bufezudifajexadodo.pdfIn PDF document text
    • http://laduses.nl/image/file/47050689011.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/bd341b5749586dafe6648f586ae78858/kagolitav.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/44bebdec0a86c5da0aa6107c73dd7d3e/29296065877.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/fererebirifixerenov.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/kampdkd59c2ktj9scj2chhgbf8/mepuxosabitig.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/xusijozer.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/39895439079.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/8fa3e7ec8887529f712c56f200313436/xewezikazukuxobum.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/30265502637.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/3prde8nql62bafv2st62ub44c4/87309133322.pdfIn PDF document text
    • https://bataretak.com/img/files/file/pizuvizukileriteredez.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/84178095926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+find+line+equationPDF 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_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 17328 bytes
SHA-256: c032825534c57a273485b8e76bf6f6fa3097ff0ef3620c1e73d841000e76b3be
font_01_sfnt_off00011f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001372b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372B 10400 bytes
SHA-256: 7741fbde56d6796970da0ca7e0debb0d749c95f303297a5b261297d37b9bc6b2

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