Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cfb95abe20a56e…

MALICIOUS

PDF

68.1 KB Created: 2021-09-29 12:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9b6f7d66c4b50af2b8ea8bb93627ece3 SHA-1: 9ebaaa4d4ec5f6eeff62d666fb0382ce78d785f5 SHA-256: 65cfb95abe20a56e6c58d69d81ee7e5aec9a41c27832e275cc4b78b70ea06bc4
118 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as a malicious image-only lure, typical of phishing campaigns. It contains numerous links pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier strongly indicates maliciousness, and the structure suggests it's designed to trick users into clicking through to an external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • ClamAV scan did not complete info CLAMAV_SCAN_INCOMPLETE
    ClamAV scan on this file did not complete (ClamAV error (exit -15)); the verdict reflects only static heuristics. The result is not cached so a later submission will retry the scan.
  • 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://chcial.ru/uplcv?utm_term=caller+id+apk PDF link annotation
    • https://md-bud.pl/szklo/photos/file/78617402681.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/vusifajesife.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/lesevaperizotirojovabed.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/59955761953.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/duxiniwutozuzoweze.pdfIn PDF document text
    • https://pixel.bg/img/file/mojorexobezadoremosimin.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/fuxera.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450021e38a4---sasexibijevopekipe.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/85939014126.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/bf94306aed77dea4fe17d94a1e7b7f98/wibokokivoxinuzizuru.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/6451583614.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/43519813968.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/pasovuronidexifo.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/6c5477aa06aacd04c9120d20f8e6452b/83599021194.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/ravanijefalinuwugebej.pdfIn PDF document text
    • http://prmakeup.com/Image/files/36187520277.pdfIn PDF document text
    • http://poliambulatorioargentina.eu/userfiles/files/vurowegirigek.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/riketuxibidejalapejoz.pdfIn PDF document text
    • http://erimti.com/userfiles/file/2148308010.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/81984636683.pdfIn PDF document text
    • http://rafaelokazakov.com/file/vukim.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/kuvebubunuba.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/molaketukomejuzo.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/zamixagakedefapo.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a3fa64caecebb75be34d48249fad5b45/392733117.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_off0000b29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB4 10016 bytes
SHA-256: e5fa3894209d3b76978f8582c03b2a46d80443c6aa04bacae1389e8bed4e2425
font_02_sfnt_off0000e0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F9 13720 bytes
SHA-256: a44415e5c382a2c18a106c0c2a10e6c467e74ac8b864c1d9d582b1d8913da79c

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