Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb6f354e1a2f028…

MALICIOUS

PDF

76.7 KB Created: 2021-09-07 11:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3c3568f0e0b5e1e5cf49dc894e9b604b SHA-1: 497a708a6b19720a9ae886d778c1d4054dc1892a SHA-256: fdb6f354e1a2f02871630fb34cc09198fa63726846df7adec3f9b4e1c01bdb06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised CMS upload directories or disposable hosting. The presence of numerous links to potentially malicious sites suggests an attempt to redirect users for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smartstone.ca/userfiles/files/ginopopuguxirozokafisis.pdf In PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/c730d8307e33fc2608845b2f431291e4/rediv.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/luwinakiraripuve.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb2422b837c---zasovujaxoxivipuxavo.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/cfa75a6ffeddc3a600201cc67d3789b7/76560330906.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/fususolabowikel.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/88393801187.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/84278566788.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7959bcb02b8147c0253653920e57d7b4/denidijibuzulaw.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ec388b3bf---wezapadejefititiwexa.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/8362f3357652e51c895ee3e00fc88311/lobagamatusumogerepe.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/setujukixiwavubakubuzi.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/vebos.pdfIn PDF document text
    • http://kd-council.com/upfile/files/xaginajediz.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f0fbccbfc---vokepavep.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a9e379a74---vazifalura.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1623871040793778450.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/8528648888.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/refetomezevusebolet.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951fcb3deb2---19849196074.pdfIn PDF document text
    • http://citra.cl/userfiles/file/pazaligujinoxoxejofujo.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/duxizekufimukuxitufatup.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/54075781437.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/95508483137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=zonedirector+1200+user+manualPDF 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_off0000c40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40A 18392 bytes
SHA-256: 30ccbaf2172f397cce459ed7953ff5d7af87135d087f8c6aa7c9efbae76301f7
font_01_sfnt_off0000f3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC9 10888 bytes
SHA-256: e653c6e5b792c4ee676215033ea5b112074f944f77fd650cbcd3379e45c22ca9

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