Malicious PDF — malware analysis report

Static analysis result for SHA-256 455de4c7c5ac2d79…

MALICIOUS

PDF

68.9 KB Created: 2021-09-01 09:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b6a50b3381a175714da563c6944bda0 SHA-1: cb9a5b14b6abd810364f0d1e2cfc7d20aff4e378 SHA-256: 455de4c7c5ac2d79a0a4e4e42e2365b82e5e1f0959cdf796de351c2e9a7ffb3a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to trick users into clicking. Multiple heuristics indicate it functions as a link farm, directing users to various external URLs, some hosted on compromised CMS platforms. While no scripts were directly extracted, the presence of numerous external links suggests the PDF's primary purpose is to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ersatzmonitor.de/userfiles/file/95616967417.pdf
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/durijafuja.pdf
    • https://akanaymatbaa.com/calisma2/files/uploads/82530625598.pdf
    • https://renhedc.com/uploads/files/202108142049232914.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2978397ad---56690685362.pdf
    • http://wakesup.org/userfiles/file/topuxinoruvigobopano.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f0e282124---89420706910.pdf
    • http://afgventuregroup.com/cfiles/file/wemolunugugetivi.pdf
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xawewiwawusorenutoxa.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16108a65d84d72---kezorazamuj.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/6df8a284ae42f3c39e0a1980ffc31802/93790148356.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f7988284c34---25379514672.pdf
    • https://esvigo.com/upload/files/13472795423.pdf
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/72916144669.pdf
    • http://krukaiart.com/userfiles/files/rekadutirajamabomima.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/73169242258.pdf
    • http://nprofit.hk/userfiles/66019804701.pdf
    • http://mmbc.cz/_data/user_files/file/86802477920.pdf
    • https://confetti-seasons.ru/upload/files/94280241028.pdf
    • http://al-bandak.com/userfiles/file/6731818733.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/15jtroffseapnpnh01fcgbc13d/2055912395.pdf
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/44529930278.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+use+wine+to+install+windows+programs+on+linux
    • 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_off0000b12a.bin
d438c197ef2cc04ccaed0d2d455506c3dbe38dedd42e41241f951f59720b0122
pdf-font-stream PDF embedded font (sfnt) at offset 0xB12A 13584 bytes
font_01_sfnt_off0000d268.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD268 16792 bytes
font_02_sfnt_off0000ea7f.bin
039ecf5b1b17fc19f3052b7aa7e910989e93fd5c3386c0931d3ebe3c4b4e7fa6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7F 11012 bytes