Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d971c47f37e4f0…

MALICIOUS

PDF

111.0 KB Created: 2021-07-29 19:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0d86f134d1a4ebf828703082eefdfb36 SHA-1: 3d00b48086fe933297e98f8eb780a82cd1e88bc3 SHA-256: 57d971c47f37e4f0001a1e607097e1fafa4297b191be025f454456b175ee3475
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, some pointing to compromised CMS upload directories and others forming a link farm on disposable hosting, suggests a phishing or malware distribution scheme. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the lure aspect, implying the document is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://krisoc.ru/uplcv?utm_term=wwe+2k19+ps2+iso+file+download PDF link annotation
    • http://gpszone.hu/upload/userfiles/file/31114101183.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/42275553843.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/mawubowewugimegorodeboza.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/72164175162.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/19577575950.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/suziveva.pdfIn PDF document text
    • https://lasanisports.com/files/putof.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/turowijimekevivojimabib.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/33226940504.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077071165ab4---69769951442.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/bonivalulokivamudetep.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/gojulenalezu.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/wonidukod.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160abd3fe7100f---gikezemaxuxanagaweteb.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/kitetobuwarome.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/6a047d49ab22e0c55f4661417f1ed910/42922585978.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43e70ede5b---15209846331.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862f3b7cb84---83382372978.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/4de4426f4409ed83604d6d35f234fc33/rusuketanijobufabizovud.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/dutevimomezon.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/dugunejuzej.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9B 16696 bytes
SHA-256: 47baf08a9dd4d05c31c96911c1244e69ac61cfd07ddd4b08c09457ca23871101
font_01_sfnt_off0001471d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F2F 20072 bytes
SHA-256: 96a59ae363e3e4f5f469c70e3f710e9efdccb2a38d2a906d076b2e9d749da511
font_03_sfnt_off00019414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19414 10804 bytes
SHA-256: a3ddeb1ddef31d38c14325960dcc7042161e0d9866ad248785217fa8a81348df

Open this report in the interactive analyzer, or submit your own file for analysis.