Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe852cb5bf9d3a2e…

MALICIOUS

PDF

77.6 KB Created: 2021-09-04 15:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 98c6cb7905150373cb2a3bfff5f71128 SHA-1: e8870a31b1e3bfa9f70e30b441d3896471b0f3e4 SHA-256: fe852cb5bf9d3a2eecf7219735a5cf115eaa95c9ae8b2a0b30389ab9a248405c
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The PDF structure itself does not contain executable content, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/7b2402d941b8336d7650f27d86e05979/72149371355.pdf In PDF document text
    • http://youngshiny.com/userfiles/file/1621207391.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/4171127933.pdfIn PDF document text
    • http://cl-pub.com/files/files/kokafadobupefebanezika.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210828_043849.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/19fada5b189545730a67795868ed96f0/25470939392.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/gogewuzarumafe.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/felagebubit.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/86173360621.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202108311520081150.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/48423192761.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/tomid.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/ct0tv7e8hv58n1fu2ji30dvevq/29741712910.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16102e72b2c684---koluzajakamegal.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/cvebuvdt1s6iq4nmafcdd8c5j5/fisimaxomimimakobawor.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202108301659571334.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85d473f287---goxenup.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/gijoxiwizamiwebosulal.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/aa60421324fb1dca85bba2dc41b977ca/63030610707.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/80502115674.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/rovufetavukawomega.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a156d452209e7ab6f0e09d82e769d6c3/wuboxatufev.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/lubk44i9i8dovlvh2m916qjg9a/javako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=extra+county+schools+in+kenya+pdfPDF 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_off0000c9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E0 11108 bytes
SHA-256: 520c6a32b820d8dd76f7803f33849967284971a50d65436580a74168ff9f8901
font_02_sfnt_off0000fbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC3 17436 bytes
SHA-256: 92d8d1d5c64dbd7467b0687e308670f98834bf53bf8877b31338f385f434042a

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