Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba05b540b4b7d236…

MALICIOUS

PDF

72.5 KB Created: 2021-09-12 07:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96e79209d47a7b2dab91b5bc235a3871 SHA-1: 7921abc7539c8505ffcf24f5868e9f9f6aa63c2e SHA-256: ba05b540b4b7d2366c262bd493216628c4fcf9221ab24f83ded2d6a5958c86a4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised or disposable domains, indicating a likely phishing or spam distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a campaign designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://qapoll.com/2015/vat/upload/files/sijaliwitamalewin.pdf
    • https://namratalakhotia.com/userfiles/files/sugobanimatagibi.pdf
    • http://matsonconstruction.net/userfiles/file/90107973957.pdf
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/danin.pdf
    • https://ateliersmq.com/pevron/www/img/file/65284620624.pdf
    • https://matfplayer.com/calisma2/files/uploads/87647108694.pdf
    • http://honyi.tw/ckfinder/userfiles/file/pasewusilabajemikijomezu.pdf
    • http://carraracucinecomponibilitrapani.it/userfiles/files/81100696129.pdf
    • http://lexprikson.com/admin/style/images/userfiles/file/61088006799.pdf
    • https://glearningsolutions.com/userfiles/files/69281886417.pdf
    • http://modulobase.com/userfiles/file/fokabawomojofuz.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161357e38625fd---39436179502.pdf
    • http://kapfenberger-schuetzenverein.at/userfiles/file/netesukox.pdf
    • http://mlead.net/images/e/file/28978578935.pdf
    • https://pindimana.in/uploads/file/tuwebuka.pdf
    • http://suliaok.com/v15/Upload/file/2021921231102568.pdf
    • https://triosms.com/userfiles/file/tolebaguzibelixajuke.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/f153bdde9ee73587a0a902286d1875c7/27272764825.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/361fe3f35c26636afbf5871c4fe19495/belijofixejikariw.pdf
    • http://alltechsro.cz/files/14083343996.pdf
    • http://theponghop.com/upload/files/23629503917.pdf
    • https://lanegarrett.net/userfiles/file/lovevokubis.pdf
    • https://www.informacion-indoorclub.com/boletines/img/file/vitexaredevazul.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=mehandi+laga+ke+rakhna+3+full+movie
    • 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_off0000b8a5.bin
a88ddaed412fb0fef4f890dd2fdaf59d5b8fc78820d9fc56a0102c13b709a54a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A5 10956 bytes
font_01_sfnt_off0000d19e.bin
ccc81490239ba106debc26262888a39e2da5325529898e9e426261daeb69cf64
pdf-font-stream PDF embedded font (sfnt) at offset 0xD19E 16688 bytes
font_02_sfnt_off0000fc92.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 16792 bytes