Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f81ca1544f32275…

MALICIOUS

PDF

65.1 KB Created: 2021-09-25 04:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63be409fe05318e988fe4c8c3f353a5a SHA-1: 4428139e4036bf6d7c822a96c5823e62bd1fd368 SHA-256: 9f81ca1544f3227549041760b1a3d3672bb42aa40e9300ae58587e35d63fa18a
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. The primary attack pattern involves directing users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5448

Heuristics 5

  • 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
  • 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://vizugy.hu/uploads/files/wotoguzinunotegexubi.pdf
    • http://woykoff.hu/upload/file/84725489834.pdf
    • https://youkuvpn.com/upload/files/xukupimubunuxaroxuru.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e2d7b4a6f051cde5524d2c19bb593ae9/jizep.pdf
    • http://imaginove.eu/data/Files/93080441505.pdf
    • https://cathita.vn/upload/files/zebedaseditutad.pdf
    • http://wojno-stal.pl/pliki/file/25560070309.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/3qoc4463l3603av076aosqrlpr/rogiliwiwuduvopekifotawo.pdf
    • http://senvietsystem.com/ckeditor/upload/files/63192865985.pdf
    • https://economiadecomunion.net/ckfinder/userfiles/files/givikowogejolimikidata.pdf
    • https://ehbo-oostkapelle.nl/userfiles/file/23964313568.pdf
    • http://dryoucosmeceutical.com/userfiles/files/gidawuramikajeketovubo.pdf
    • http://ahzgbh.news-read.com/upload/files/nodetuzufofibo.pdf
    • https://sieuthimaycafe.vn/uploads/file/ladofiwabir.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161390800a8676---zoxopi.pdf
    • http://infrabud.eu/fckpliki/file/babemaxixi.pdf
    • http://webinaris.training/ckfinder/userfiles/publics/files/99392016117.pdf
    • http://www.slenderclub.cz/ckfinder/userfiles/files/nopax.pdf
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/45628782381.pdf
    • https://saikekanglun.com/filespath/files/20210925021155.pdf
    • https://suacuacuontoanphat.com/upload/files/dawiwonimur.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161460b3c8621a---96367982780.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4dba6b4b2---51379645279.pdf
    • http://strandedtattoo.net/file/13648728442.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=vidmate+mobile+app+download
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1b9.bin
780feb1df8ac41b51c1cb67b48c5f2a82215dd35b90b98ccb2da9393271fff77
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B9 16020 bytes
font_01_sfnt_off0000db12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB12 16792 bytes