Malicious PDF — malware analysis report

Static analysis result for SHA-256 564b1a2c95759eaf…

MALICIOUS

PDF

77.4 KB Created: 2021-09-17 19:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 04f12e0d80b74a2f0d0303177b357e84 SHA-1: c4251e18b3f621debe7c95b4c7042e98bf35e3ab SHA-256: 564b1a2c95759eaf983cedab7d6d3a4e9b01f84eb18d184cfbbfa01ab6126d0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://cructi.ru/uplcv?utm_term=how+to+hack+clash+of+clans+no+survey PDF link annotation
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/asbjng48cb0gvnaogtpr39ur11/kefukuzepofojepevodil.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/sogojakisiminaxofotudisa.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109031436287026.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/33179803281.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fosik.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/sapibamu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rium6gqvn5a0ednjpfrrl7crf7/ledureful.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/51193937486.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/14174956803.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/437h8vt2goc7tacu53c4491o6l/87022088391.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/jutulowotiveselifaz.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/095322d5369f8e323533f085ca1825d1/fezudun.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/41923335075.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210905172414.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/batalasamuj.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/92715623724.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5dbc31f08---9237899426.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/52042638861.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109121848477127.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/toxogutaninaripoba.pdfIn PDF document text
    • http://onlinevay.com/upload/files/68642701439.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613a077c9760d---70834083188.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/50318221494.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/81976257352.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/24394551032.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/41722174576.pdfIn PDF document text
    • 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_off0000cafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFA 16844 bytes
SHA-256: a8fd4d2df470c23313bc39fe162dcb411e3e03f2be51feb9238ca47a80c84879
font_01_sfnt_off0000f713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2A 10788 bytes
SHA-256: 8a9b3940e90cf492d309282cb9ea0edd41fcbd1b291df53fe8ca60c453ccfe97

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