Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a46b7cd0561c954…

MALICIOUS

PDF

83.9 KB Created: 2021-06-14 11:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c5eb11c41a371fd3ae33e638640d4c7d SHA-1: 8257a7ad6939ad443494ac410f7963b575aa14bf SHA-256: 2a46b7cd0561c95419bfe81fdea91e8a5a45c60b550227877f762cf32d2d055d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms suggests an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://allytemp.ru/uplcv?utm_term=kode+transformers+ps2 PDF link annotation
    • http://babywagen24.de/userfiles/file/774440252.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/nununixizodenogizigom.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0578712001620429141.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/fitidegex.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/dofovarawerewata.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/dekidop1621054707.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072bf4b6e17c---31063159815.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/30920525124.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706cf7a2332---fisizebivejojixurojuv.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/xazegadajezo.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/63451855044.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f179e6263c---patiwumomivemakuniw.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608920073da23---kozalakan.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/3nh4brvblo9mjhb491ushldrr6/65873416666.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaecf3d777---13393305312.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 5256 bytes
SHA-256: 8fe0d176081ea6912ada60462a1984505b8978be18e899b6640a492d69b32c8d
font_01_sfnt_off0000fafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFB 1664 bytes
SHA-256: e7c7324d2f9bdf720d5f5378dc454f66df6c820f604ce748c0e830dda9606be7
font_02_sfnt_off00010338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10338 10860 bytes
SHA-256: dfc471118a9a505e96de83352ea3924262719df8e9097ca8ff66ac8828e25d08
font_03_sfnt_off00012871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12871 7864 bytes
SHA-256: ed40a98df9a8ecda30742b1b65616f13048630db53399116bc1e33f2c9d99f77