Malicious PDF — malware analysis report

Static analysis result for SHA-256 b32696dcd793fb14…

MALICIOUS

PDF

76.2 KB Created: 2021-09-07 02:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bad4dcce0b67ebc2610267b7f62377c4 SHA-1: 92fe1142d54d0effe67cb5b7cb653cbc46abe4ce SHA-256: b32696dcd793fb148fd25b26450142cba6ac48b01e03cd1b5edcf7fe26e4c048
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true malicious nature. The primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://slovoveri.org/userfiles/jeluvijiruzepakem.pdf In PDF document text
    • http://a-mega.ua/images/uploads/file/rupeweretabinem.pdfIn PDF document text
    • https://duvanco.be/docs/files/wefafu.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/967fa7e6120a4310482ba6ab2ecdfe69/54253380324.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dc9d4e7bfd2b68ba235213a5c7406a30/4908600987.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/60468817704.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/jixuxakideso.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/45323345701.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/rapepunewegapes.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/24628abf8806b19a9711e13f8d9d4f79/10833181347.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d96646e5245---4797442654.pdfIn PDF document text
    • http://coachhouse.info/assets/file/87811341059.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/wasenifiwiva.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0e618288e---bosufotoxuzigarake.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/42016306340.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/932ed7928a51f259953270f14569c1d3/bubekofixup.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/81019099533.pdfIn PDF document text
    • http://domplus.su/userfiles/files/kujaxasujozotido.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/doxeguj.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/tofiketuv.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/85571428.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dff124fcc0---94782889735.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc049349c8---55050021730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=punnett+square+worksheet+blood+typePDF 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_off0000c593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC593 16896 bytes
SHA-256: 5e7005b2318a377ba872089450f15354ba175a13bab413dcf06c96f8bd92f2af
font_01_sfnt_off0000f16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10981 11076 bytes
SHA-256: 111f1989ca583dc66a1a83bd5c79c2f410b4a90c034640bac206cdd5e3e56bef

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