Malicious PDF — malware analysis report

Static analysis result for SHA-256 d95d7ba374ab1c17…

MALICIOUS

PDF

85.3 KB Created: 2021-08-01 11:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f8f12284b85e3b813b28dac33d05803 SHA-1: dff28cd4b969ea65bfad60d7f1391737f0f5de04 SHA-256: d95d7ba374ab1c175900178afbf24b06cbd525f0dde62540470527ba7f6ba0e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://study-go.info/wp-content/plugins/super-forms/uploads/php/files/d62b688eb67655002a68a5f8fd365ca4/fasejaz.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfc48571fa---48322948385.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/lomefawa.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/82342473280.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/fuwikapizaz.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607beed8a2c33---21917025655.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607782a5b179e---59757727067.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/vazetafuxasi.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaa3beccd5---xewuwibiwonuwala.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/60754777241.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/1439890031.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/lomaporepaniziwobuj.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/m38fp77v4pqa250bpsvkk33ib0/33595153647.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d034cf6f5---91653970578.pdfIn PDF document text
    • http://mebco.ru/images/file/14237628179.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/lumar.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/8c721b234d51d99be47ee9a4d64395a6/sizoleselunekujumisiv.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/14132104940.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/4238710119.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/53178753412.pdfIn PDF document text
    • http://waypl.pl/upload/File/66737405553.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/50994467997.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/n3kp7d1k8u03mgr0t98bhruudo/falebegaxuwego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=acorde+f7m+guitarraPDF link annotation
    • 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_off0000e77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77C 10632 bytes
SHA-256: 8259722798bd91751313a24151ea9268d0fa8793005086f744c608c8dfdb6980
font_01_sfnt_off0000ffc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC1 18728 bytes
SHA-256: b50113006a2196a83e6c8bd14c231b4c682d930bf33b23e84dc6157298b9ebba
font_02_sfnt_off00012e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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