Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0317272bd4dc5e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-03 10:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 10db773221e3ae0751af7d977f890eda SHA-1: d0d6d6cd6a0e72cd1c012390572c2c9ae74decf0 SHA-256: ac0317272bd4dc5ebb68ff8389e5cd56ec7e22a0d33dad3f3431217e0905b331
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of these links and the overall structure align with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0beb74b40---topurodojapigusuwe.pdf In PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/20040244060.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870d66b2960---mokesowe.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/16106656639.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/48907706667.pdfIn PDF document text
    • http://sushi-belovo.ru/files/72081814607.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075a1ade443f---74657503923.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a588254d8ed---72952636127.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/vefev.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052006165870554.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/xemagetupowijukoxezajo.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/81648567058.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c790ef3bf6c---75882310041.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/30974011981.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/59178167381.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/302edd8c9a009cefe07fd03e6b169071/seworuxumadesadakej.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/fda44d2d4f7121751fbdb253644af6ce/jomatipiluvutokevava.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/83301998251.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/14112418849.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/il16aidootlgdhvkea77ipeck1/97585073790.pdfIn PDF document text
    • https://digireg.ru/upload/zekekagamaroz.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c49593474d4---firuxikovopadazugaguxike.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf8f5f3651---20230767765.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/15435424fed10e958c76d6572036f056/todapuguripojapasibepixef.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/c415f572d3bb5a89e8ae00c15c5908b1.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=phantom+of+the+opera+pdf+pianoPDF 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_off0000d708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 18080 bytes
SHA-256: fa88f786bea9ecb33b47e411573b6cf15984a499b46ccb1c93ffb10197b7f688
font_02_sfnt_off00011ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED9 10548 bytes
SHA-256: c5496f3fdf207a56f060f74be5e86117fe01f938a5d4398d05c83ac3f29639ea