Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c2d1834f2a5f28…

MALICIOUS

PDF

88.0 KB Created: 2021-06-27 01:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4bd7561c4b2bf0ee510d39752eb47088 SHA-1: 57b297c6bdaaf1bfa4c9c659c17a9dec6ce38bc3 SHA-256: f4c2d1834f2a5f2894fe471398c452f34d95a142626710104587fd4a7ccb2b38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute traffic to potentially malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URLs are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a17817931---99478253543.pdf
    • http://dzbnf.com/upload/file///75899021847.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b7aff080260---jujugonop.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b465fb0588b---sepidumalozewivub.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afc8d92e90a---pesiwesinatosenofij.pdf
    • http://intergeored.com/upload/File/mesokota.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/48b8ed477a4abb49922cdaabc0e7b50e/nepolegedewogaxima.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b3f6dc79c---nelorebamolo.pdf
    • http://www.radanhorse.com/resource/files/rutepupawemulomerukedor.pdf
    • https://vigiweb.cl/dinamicos/files/file/buborewiwumonikodekumuvin.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b5feadaff95---romaji.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608d73b77bc01---gozifawikijofitefi.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160949115a7c85---39127672685.pdf
    • https://mavibusiness.it/file/33948855229.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/40881943377.pdf
    • https://chupwo.com/editor_upload/file/batunosexawu.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/kijetawex.pdf
    • http://amphorabeautyclub.com/campannas/file/56438939277.pdf
    • http://akinmedical.com/uploads/file/97214905313.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e99b83ebe---doxibeminigoboseped.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160837082215c5---lapigezuzevazunexu.pdf
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210622224544.pdf
    • http://orchid-daikanyama.com/userfiles/file/58344207904.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b8ae41855---81318042770.pdf
    • https://assignmentmart.com/ckfinder/userfiles/files/14287686385.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=union+of+sovereign+states
    • 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_off0000eaf7.bin
fbe42f5eda87740cc7165804145e597d834909b11eed924bd9b65b947e922adf
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF7 22504 bytes
font_01_sfnt_off000122fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122FA 16792 bytes
font_02_sfnt_off00013b11.bin
93e21eb9ec6b110f8c11b67a896ef8ddc14739697bb892d19df779a44143e670
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B11 10416 bytes