Malicious PDF — malware analysis report

Static analysis result for SHA-256 773721d2bcc62780…

MALICIOUS

PDF

114.2 KB Created: 2021-07-04 05:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8be4b15f117a542dc0d7c46a54ef3ea3 SHA-1: d2ad34597822f838938526607c812a6358b01a37 SHA-256: 773721d2bcc62780e65d8926ec360cb4d1cd9973dd341afd056c3d2bbb671f41
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is unreadable, but the heuristic firings clearly indicate the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

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 https://ludifrance.fr/userfiles/file/99461319358.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/cfe0a8c8e7213774662493c2bcb945c7/karuwigas.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/f1bec69731df29640217b6f3a6a0cb71/59646436080.pdf
    • http://benevolo.it/userfiles/files/68052158577.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075989dcffb7---46342183904.pdf
    • https://zionapostolicministries.org/uploads/file/25229288826.pdf
    • http://universalestetic.com/userfiles/file/satawusaburedasaja.pdf
    • https://aneri12.cz/res/file/gajeniwu.pdf
    • http://jrmhandling.nl/upload/file/bokudijitozevexitoga.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a35874e10---bememigufesomexoror.pdf
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/wejixijavadozo.pdf
    • http://cocoal.com/uploads/file/15791780764.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a21b9610fae---gedarelar.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc3fe1bd8f---3740042098.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d1700bdd36a8454ec4b8e9e70e67eae9/43485742193.pdf
    • http://pnmanagementsolutions.in/uploads/dutiju.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/bcca0df5f7eddc7e431b78f423627181/kugijoraworiz.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/43be0ad3c180172391446c9bf053146c/59335909779.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083c4a349de8---xujurafatomuziximolosetar.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/zifosenakedusuri.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/73f8e1213bbb3087decb244d3231de94/90624908772.pdf
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/17544080149.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/fe517329b4b02981cbe0a713392c7b0d/73728398145.pdf
    • https://ratsimae.ee/media/contents/file/vinidesog.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/2525ce6aa7d9e01490a86111abc1c00a/tubofovevugamez.pdf
    • http://phantasos.org/userfiles/file/rowafu.pdf
    • http://hotelpenza58.ru/ckfinder/userfiles/files/80521248061.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=whitetail+doe+call
    • 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_off00015eda.bin
e2e70d2861050fc8416cc05f84fc1ee46f2d85b762786251d116f5194704ed5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x15EDA 10088 bytes
font_01_sfnt_off00017573.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17573 16792 bytes
font_02_sfnt_off00018d85.bin
4ca29cf33d7eda65993872ed0da634a5b8cb0fb9b13ac5219bbe7e9dad6d48d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x18D85 17628 bytes