Malicious PDF — malware analysis report

Static analysis result for SHA-256 8311ca012eb8d76c…

MALICIOUS

PDF

87.2 KB Created: 2021-06-25 12:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b907e9276471fd3c681c630baab4e42 SHA-1: 68a02e99524ad07f6bd792dd38cc868486515cce SHA-256: 8311ca012eb8d76cbe74acb30bcca6bb898f0c96035cca1e9ab34fa1d13b891c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites hosting PDF files. These links are likely intended to redirect users to malicious content, fitting the pattern of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f416e4dd5f---65154186429.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c9eb9dc79---78371324420.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607127d471852---podozajunekafonobefozaw.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7b9185bb8---50198755944.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864574b7d94---93108112190.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/oj8idpc81m8n8617m3sckidp4o/46122938257.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/hdfracok43j8joeiv0mf3421rm/matomaferijobuwamivuz.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093174755b0f---jabakipegububuziw.pdf
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/kufejojo.pdf
    • https://aljazeerahpetroleum.ae/userfiles/files/99426840593.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f77498348b4401f773e33db26df5b064/valaf.pdf
    • https://amatnieks.com/pictures/image/katerabi.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/m3onensm1erih8khnvv09ouob4/xivajirajox.pdf
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/waril.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b77d1c79c73---kikuf.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c918e607a6b---kumasibesagalokunofutikef.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/snmvm6ib8dmnirtcl0erlii5f3/nolanuv.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f540ece352aa3a430e5fcfac70e7f012/79189724176.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=focus+group+report+example+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AD 16792 bytes
font_01_sfnt_off00010bbf.bin
c2abd9d263db69b6767f42b2e2fcec2b7f382f082071dac7a8d304ea1c06e4ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 16784 bytes
font_02_sfnt_off000136e8.bin
c967af6329eb862943d29b027c8e562c7b9bdb76153e1e78c1a917afd541707d
pdf-font-stream PDF embedded font (sfnt) at offset 0x136E8 10948 bytes