Malicious PDF — malware analysis report

Static analysis result for SHA-256 03716d1b65c3c67d…

MALICIOUS

PDF

75.8 KB Created: 2021-09-17 06:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f606dd6ec8fc674f2a918af197df45f5 SHA-1: bcfb3a6d07237e8aa778790e4a323d13e4cacafb SHA-256: 03716d1b65c3c67d30a3df4ff38d04bbfee8a504378358089882fdc72370c703
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm intended to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pixomot.ru/uplcv?utm_term=how+to+start+force+stop+app+in+android PDF link annotation
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613549c61863a---wivoneluzitexomafutovu.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/54856768962.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/mebuvopim.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/4040451290.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/47312354216.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/45199108444.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/gerusof.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142abe27576e---49732079996.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/gokuzadibelimaburige.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/valuj.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/94940756555.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/68974693938.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/37475245036.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/tonojixalusutabidokafa.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b75dc2086---fumilutizarewizi.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/ferufaretagopanexu.pdfIn PDF document text
    • http://tai-group.com/upload/files/tomuvitewotutanimejuzitof.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/xefutixi.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/98037210912.pdfIn PDF document text
    • http://dges.in/userfiles/file/15330536073.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/nilupabeki.pdfIn PDF document text
    • http://dmkert.hu/files/file/17477348819.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/69630790858.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C4 10644 bytes
SHA-256: 668d741504a2cdca31560fa3b73e6eedd7c9b6453f4e7178c59203b52897b103
font_01_sfnt_off0000de4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65C 16796 bytes
SHA-256: 9fa894606606eb6750956dd75fe588a707989cbc106d6596535c0ad7bb794302