Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b508abed90902d…

MALICIOUS

PDF

78.6 KB Created: 2021-09-05 15:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 247b0b1180d9663dbd5eead027ba90fc SHA-1: 73f1db765d62faeb04de1b6b15b58967b031b324 SHA-256: 38b508abed90902ddbfafd5578216b0ae93fd382a0a7f34aa66e90d25854dedc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://lynhuagiasi.com/Images_upload/files/43470671588.pdf
    • https://jmtours.co/aym_image/files/54640291989.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/bf3508ad4c96873184aef8b9b4f0373d/riwirufixesubipanan.pdf
    • https://rux-thai.com/ckfinder/userfiles/files/11510316713.pdf
    • http://airsoft1.ro/files/file/sekidijeriwiwekovejimaxa.pdf
    • https://www.prshots.com/ckfinder/userfiles/files/78668410219.pdf
    • http://agrobud.net/uploaded/file/donuvuburad.pdf
    • https://thietkevuphong.com/uploads/image/files/2436368243.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160723ea85584b---wulufipaxavumu.pdf
    • https://cape-electronics.com/media/file/35298235496.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/e6f6d40fdeffe29f29fcfde4aa0f35b4/30722476521.pdf
    • http://haai.org/upload/file/supimagosizagigole.pdf
    • https://bimstudioinc.com/media/files/48178969611.pdf
    • https://mysmartedu.com/uploadimages/files/tabukomida.pdf
    • https://ropaalmayoreo.com/images/userfiles/file/74844770128.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/f8dca2648a7d356630b92172e28822ac/14948710624.pdf
    • http://infinijewelry.com/userfiles/file/65451244795.pdf
    • http://tktravel.shop/FileData/ckfinder/files/20210722_B0CD49EEAE268AED.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/6c191297e0514d460a6779950ed0723e/62057762295.pdf
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/7931978002.pdf
    • http://nuraski.pl/wsg/userfiles/28884114866.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/21056b9f3c5d44d6d4f5ee7ece297547/73142148045.pdf
    • http://krakow4you.pl/krakow/files/dodenitimo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=transportation+journal+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_off0000cf81.bin
a35c3b7646d81c83b70d7a041ccee59c393c873efc5a814031e5ec4c755b3e69
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF81 17740 bytes
font_01_sfnt_off0000fcb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB5 16792 bytes
font_02_sfnt_off000114cc.bin
19930f4befdb641c26cae79c58f24239ad33118e09d316876459923f355766ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x114CC 10552 bytes