Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc77d214fce1a582…

MALICIOUS

PDF

81.5 KB Created: 2021-07-12 23:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 690395ffaa0c4ebaf4cc6064a25629f1 SHA-1: 40d0bdddf4c638eb5e085435d14067a9251ba732 SHA-256: cc77d214fce1a5822da094f46f5c39c1578b90dacce4354a6687bbd1bee2f69a
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=breaking+the+spanish+barrier+level+2+intermediate+answers
    • http://harrisonsfamilyreunion.com/clients/62911/File/rakeroj.pdf
    • http://capitaldanceacademy.com/userfiles/files/1886011352.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/50779b2b64c41b027c875dba01254a8e/lenapiwanakugavikev.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a30385999---golikosere.pdf
    • https://jagamimpi.info/contents//files/vawalam.pdf
    • http://aaaexpressac.com/userfiles/file/58353383743.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160757ffee9c55---10387775245.pdf
    • http://metabolit-plus.ru/files/file/povujokovizin.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/3s3sano3lod8761lo715jae5ef/pomixokejilovezirikevakod.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/atgenp7vh059jkmvufq3tugs84/dikeruxumomosigaguzit.pdf
    • http://zekidilektekstil.com/images_upload/files/36933801191.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f6882f6ba---xitazapinufedulexefaxo.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160893b0f8deab---16932043321.pdf
    • http://elmbbq.com/uploads/files/74548565959.pdf
    • http://shinex-auto.com/userfiles/file/21001804992.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/si1j67uge6v03t12j1fdmbkc65/junaduwapanasudipilezob.pdf
    • http://iphysiology.ru/upload/lirotov.pdf
    • http://sosonomo.com/ckfinder/userfiles/files/dumezamowebafan.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/kalumijetukenazobufuzu.pdf
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dujetenevimiputoxuti.pdf
    • http://aircond.md/upload_fck/file/18228117348.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8b04375c1---xagubo.pdf
    • http://hoshitorionline.com/uploads/files/xoxuwizatukumuzokubik.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab36746dfd2---46938558079.pdf
    • 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_off0000da4c.bin
525f80aadd3ff50f942289303e2e6cf58fba28c064cb120282db68889accbfa5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 16892 bytes
font_01_sfnt_off00010641.bin
dbbd611951919be699ea4e514c3668434cc0b1ba4c008ae12a4dad88c56c322e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10641 11276 bytes
font_02_sfnt_off00012036.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12036 16792 bytes