Malicious PDF — malware analysis report

Static analysis result for SHA-256 9850ad7ef4f87eb9…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 18:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 663170d56362a636d71ba059aa96ff09 SHA-1: 50979af8eff5ffbd41db8009805c14f9be0115ca SHA-256: 9850ad7ef4f87eb9a3d6fb53710fdd1c13ddac2606460471cf93d31e7cb2d157
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to various domains, some of which are hosted on compromised CMS platforms. The presence of multiple external URIs and the 'link farm' heuristic strongly suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://motopujcovnateplice.cz/userfiles/file/vekir.pdf In PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/25779027541.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/jopuzanifilolunobukuridu.pdfIn PDF document text
    • https://gilbertems.com/videos/file/74332171061.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/rafefazisumolalibisofimuz.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/76474727765.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ufjlootem39i1n4kihabu4iemc/6724113400.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/80901125776.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/tomunojokisotal.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/38152277847.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/21977649639.pdfIn PDF document text
    • https://pindimana.in/uploads/file/28588850558.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/xirevoto.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/tizerobasolabovuxip.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161413d5babe76---17700457811.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/vesudupisifemalofiwixeje.pdfIn PDF document text
    • http://thepducphat.com/upload/files/63710140110.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161343916dc6eb---41839743274.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/731roulgcd06rtttragugv76b6/jalitajow.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/xopoz.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613701221a915---wufupapibesogo.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/gaxarixopixaronut.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/14663549438.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/2951115414.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/watawidaron.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=pixel+2xl+rootPDF 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_off0000dbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 9888 bytes
SHA-256: e98f4e1083423738ef2a4077435b1f5d77cf60f47dfe4c779f88b1c4d655df04
font_02_sfnt_off000109fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 18016 bytes
SHA-256: cd79a2b4d85e45a8aa5cbbba1fb1d0fb2ef5c8b79af80090ccedffd5f696f318

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