Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd9a30e19b80fe6…

MALICIOUS

PDF

101.2 KB Created: 2021-07-07 07:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c63d28a9c6bad61b7c5d4c7d655bfc6e SHA-1: c0cd286e535a4cb29366d3fdc103c2f6488ee2a4 SHA-256: 9fd9a30e19b80fe63c203f8830a2d6615eb5d355a88b659b125ad707a34adfe5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to potentially compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may leverage embedded JavaScript or other PDF-specific exploits to facilitate this redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/c8e3ed683c6a0c2662f8d942a4d5712d/68214322094.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761ed876086---41678720404.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a757d3781ba---wekipafaredev.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607202b9f0b20---31987616654.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8aaa24e84d---88839774137.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/eb87f65f39d9832586ea4a617cca5299/63039733187.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b65202ea449---26583574641.pdf
    • http://alituncer.com/userfiles/file/21738595756.pdf
    • http://apple888.vn/luutru/files/37414146505.pdf
    • http://targhevaticane.it/userfiles/files/nojaxidexigenagek.pdf
    • http://aps-mes.com/files/file/resarapewuloguvezazex.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/r5k1ssp8apccst0uc1gj4bqvgk/68930817074.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c539296a649---tokegufakozoge.pdf
    • http://viettelhaiphong.me/data/dulieu/files/261165490.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vcph29c8a6a8svbd85q6mjb6g3/4312311799.pdf
    • http://ruoumoc.com/upload/files/jajowep.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b60f5529a64---kitubogedelurinimoru.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfddefeb432---172739067.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acaf175aef5---59248406307.pdf
    • http://daindnc.com/fckeditor/userfiles/file/79388459407.pdf
    • http://consulcongress.it/uploads/assets/file/41608185612.pdf
    • http://kapelski.pl/userfiles/file/6710471369.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a961eae3915---zelib.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=complete+spring+tutorial+pdf
    • 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_off0001252b.bin
bbe5f47a303cd301cc8c65a9fe424dd693dcf7fa38255da452e3792fef1ff0b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1252B 10972 bytes
font_01_sfnt_off00013e62.bin
7f574fa40e5d6d13144182952f49e76ed63e2b73d14ac3aea732eeeba038e11c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E62 19168 bytes
font_02_sfnt_off00016fbb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16FBB 16792 bytes