Malicious PDF — malware analysis report

Static analysis result for SHA-256 444f182215d1d44e…

MALICIOUS

PDF

85.3 KB Created: 2021-09-12 02:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 38ee4f3334951a006210fb06429af329 SHA-1: f082b4edcdd06866b3b2603959a9f40ae7e6f22a SHA-256: 444f182215d1d44e79b7dffc1b2a298392427eee2806bb69540eb004e1f3b478
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised websites. These links likely serve as a distribution mechanism for phishing or further malware, leveraging compromised CMS uploads and disposable hosting.

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 http://propack-th.com/image/upload/File/pekoxenotebeselupap.pdf In PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/mubosove.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/16198778216.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161379eb4d831b---61035623572.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/kolanuxododebedav.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/c1ae6989783f7412fb2c8ec7e15e9b47/92831866578.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/xonesepazuti.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/17019709859.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/zexodaxudo.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109101805553327.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/zubimovexabakudefafapoj.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/9ea507ed3f7b5849f900a6ecd4757515/bixagop.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/fovuwipa.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/6895721322.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/na1q81op429l121qfa9nd45ki0/fotufaxu.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/72699441050.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ea4ed77a9a7c096f2b3d94a24a4c8664/98508851142.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/wimogatok.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/a2828fe98ea146bd7d8d7755133240c1/39426641216.pdfIn PDF document text
    • http://dd-eng.com/files/files/tapitovukibewajob.pdfIn PDF document text
    • http://praguetransfer.com/files/file/34313564539.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/45873966490.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/34350636203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=mobdro+for+android+phonesPDF 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_off0000e9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 17620 bytes
SHA-256: 1dfeaf00c7353ffe93c3bf692f53bb5dd61098a0f6368306346eeae516157784
font_01_sfnt_off000117db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DB 10584 bytes
SHA-256: 702f148ea97959820085608cf991e03bda49021ce1f89502adeb391e52f7ae51
font_02_sfnt_off00012fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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