Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28e7c77b6cd764a…

MALICIOUS

PDF

99.6 KB Created: 2021-09-17 05:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3630211694d598a83604c05b2714c85a SHA-1: fec22bad48cccf62cae4c4e06518a86dde7f0e9e SHA-256: c28e7c77b6cd764a7dc7be1e108798318d6451e29d29138f46e243975220dc54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs suggest a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://isotope3.pm-ural.com/uploads/files/47937553039.pdf
    • http://ingatlantv.tv/userfiles/files/82740502344.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/1677cbfb19b7e0805686c1cd76d6ae39/mapovuzowobep.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161426c5dd7661---gazupalap.pdf
    • http://stark-tools.ru/images/uploaded/zowug.pdf
    • https://crownprolaw.cn/userfiles/Proj_Name/files/minodo.pdf
    • http://vinaktv.com/storage/ckfinder/files/42062454030.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135140ba2d57---sulabewaxinolaleranezi.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/b31ea0ff8e57b1ced105dedc6c2fa11f/dolowif.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dee1b1bd24---fuwusub.pdf
    • http://ziconiavip.com/uploadfck/file/26168587179.pdf
    • https://ww150001.linebot.net/upfile/files/20210904012727.pdf
    • http://louisamerino.com/userfiles/file/zuxafabaxivofazivoruduma.pdf
    • http://www.valathors.com/ckfinder/userfiles/files/gipusuzulamijopukini.pdf
    • http://okeefesreef.com/ckfinder/userfiles/files/61871856050.pdf
    • http://giaexploring.it/userfiles/files/15106083498.pdf
    • http://ourdesign.hk/ckfinder/userfiles/files/35362662830.pdf
    • https://bomberosdenavarra.com/userfiles_nexo/files/tikulifamiwomadawukigufu.pdf
    • http://suamayin.biz/userfiles/file/jotudogefojalomowidi.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2fbe91ad---72844354089.pdf
    • http://taigesw.com/upload/files/sedex.pdf
    • http://driver-jazda.pl/upload/file/98385509273.pdf
    • https://samoinstitute.mn/uploads/assets/file/wujonawulatenif.pdf
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/doxademuvo.pdf
    • https://media-get.ru/userfiles/files/78392261653.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=stream+free+movies+%26+tv+shows+apk
    • 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_off000122db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122DB 16792 bytes
font_01_sfnt_off00013af2.bin
de077254978395e761bbe11b4a01ee0587245e143acc5ea1c83b37d180c0aa38
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF2 10364 bytes
font_02_sfnt_off0001526f.bin
a6b0ab7e66806cf470318b690bc909c1c83740987cbd72eaf8a0729620a34b2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1526F 18200 bytes