Malicious PDF — malware analysis report

Static analysis result for SHA-256 12985f4e1f3c4374…

MALICIOUS

PDF

99.5 KB Created: 2021-09-06 01:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a66a5e0b4a2688ca7b60cc151d81548 SHA-1: da2bc916dca20651aa1f7ef794b1fd481381994c SHA-256: 12985f4e1f3c4374e32e1afe0fba63e293a63b321c45a2f8dde38360bc975f8c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis to the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://wuxihemei.com/ckfinder/userfiles/files/20210808_081203.pdf In PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076e7e61e314---61545004652.pdfIn PDF document text
    • https://netpage.info/userfiles/file/goparimaxalabetujosawunos.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/kiwabiravinukixeku.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b36cb0bcc8---97589459726.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161241de4b627a---gogujewixegusiwolufexime.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609edd845555f---52106713284.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/178299ff6d3809983b6bda0fe96dcfe6/77160610976.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/77eec1ceaigjgqbocc846es7ru/zivezudigabovogafurowam.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/mufarizoladoridojub.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/49778604238.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/4d5e382e2c9acf7bf197ee1c0a0a3c41/65630420815.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/51446262880.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/872006a416137abb3696b77c332fe915/17700573271.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/63b46b66d09fb0cbea338424000274d1/nugemes.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/lanikirokogizirepa.pdfIn PDF document text
    • https://doitoutdoorz.com/file/jGj51nFn4Uff7PT5.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/nifov.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/gujixolipanokolekubo.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/mowazojajakalemitek.pdfIn PDF document text
    • https://premiersuli.hu/files/files/24403421374.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a53e28012f9---semukawineduk.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/70305769381.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/mcv30lki71vdjarp4ghb3q878m/24995739240.pdfIn PDF document text
    • http://www.bash.cl/media/file/8000882379.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/dsclrvhn7elkhbb8hevsmnkbg1/fanepanuradoloxutid.pdfIn PDF document text
    • http://palami.by/images/file/fodeganusomuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=introdu%C3%A7%C3%A3o+a+oceanografia+fisica+pdfPDF 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_off00010f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7F 11264 bytes
SHA-256: 1f827eac6c55dc7bf1cbe42c4a1ec16f0de09d6146db9070c25efadc23148e28
font_01_sfnt_off00012923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14135 24268 bytes
SHA-256: 2bbb4c9de4c78065c96622ff8edb9593a0fc1887e3afc97a40748d8059d00225

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