Malicious PDF — malware analysis report

Static analysis result for SHA-256 349c4bfc5f5c3804…

MALICIOUS

PDF

107.5 KB Created: 2021-08-15 02:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 40b4b60933b0a250dca6a236ff4aac38 SHA-1: 3d72297955ea647bd6b1ce12b05df9b8ff6b6233 SHA-256: 349c4bfc5f5c380427fbd8cdc50ee6f88e7dc115d4d9d99eccd5465dd8c39edf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be compromised WordPress installations. The primary purpose seems to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://rayer.cn/d/files/lajexuxakodavegitegoru.pdf In PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4d7958d98---rivubekewunamonusujarap.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/lv14hs6v2qprl775ankqmfig01/wavutofiwil.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d0fc0e52b0269d0b26f67a34b1f6284e/giminu.pdfIn PDF document text
    • http://hevolta.com/upload/file/35874532144.pdfIn PDF document text
    • http://iphysiology.ru/upload/roriz.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfa730cd2e---desiretagubureridixumage.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429192924123997.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0f5d96e7e---35160775006.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/19642321585.pdfIn PDF document text
    • http://usagimatur.com/files/others/68898735658.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a75c48ca9fa---75485329769.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/tixipexixefupodefonug.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895529ebca9---sujazodejewo.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/31fe86e4176c09276783a872d01723f4/99145760632.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/suwaginuworotewezolifu.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/karokabozudepa.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/nijunun.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/ravusufefekujumizuzosi.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d4e69667f---davowigadusesafodoze.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/22914153676.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/78tbgmjcopdv292104bga7jb76/97418295497.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ec6jg0a087308fgi8ol2i0kh56/kigaxurowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=menschen+b1+1+kursbuch+pdf+l%C3%B6sungenPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00017628.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17628 22352 bytes
SHA-256: b0ccbba32fcd949006b62d430dfece3cf638243f09668a708e8a42e3874ed454
font_00_sfnt_off00011506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D18 19284 bytes
SHA-256: cb335d94220837f059bf46c9e451ac3a7e16ce042e79709cc472daac7ec03c22
font_02_sfnt_off00015d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D1B 11016 bytes
SHA-256: e3b3ad097645a767d62e98fbe4c7b63ecde0881d209e3a5ac69599f8da65e91b

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