Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea1bce7d6636b76…

MALICIOUS

PDF

73.7 KB Created: 2021-09-05 14:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 134fbf57b53a7c9cb0ed6783a799c672 SHA-1: d02bfab32959992c6e404d5c045c1c9962e72c31 SHA-256: dea1bce7d6636b76f5b7234e31e300fdf442a57256276edce6408a4f8bdc1f3c
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable domains, such as http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c34e77f2a2---tiradipoxulaf.pdf. This pattern is commonly used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sesconbs.org.br/ckfinder/userfiles/files/fepujinawawu.pdf In PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/3a4b74846ac62b77f33046a029d8e8ca/lusorizebezunux.pdfIn PDF document text
    • http://cochu.net/resimler/files/44065148358.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/3nuoi3vfqlaapm725ba88k44hb/batiwadifezomubilinusaw.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/liwipimefigonudet.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c55b4de0159ce13221356557dc9151d0/pudabef.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/4549698302.pdfIn PDF document text
    • https://j26clean.com/upload/files/bujepig.pdfIn PDF document text
    • http://wwstationery.com/files/file/naxagerafapamosu.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/besukugig.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/lovasofurinukak.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/lusujisavawuso.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/52h3rgv6514f5h89kr6eou3562/xovonuwetomobunafo.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/82673243905.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43064761004.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c34e77f2a2---tiradipoxulaf.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/65883400863.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/79824a8759e0f6039687b5096bb55a8b/11218337551.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/be26c715ec4cffbb41a11bcb90ebc1a2/23788212157.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/semese.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/lagika.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/marefaverojes.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16098709568a05---sivosuxijegedukuz.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/0ddd719667e9bac4b9d088a159f05288/96194332404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=investigatory+powers+act+2016+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_off0000bab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C7 17120 bytes
SHA-256: 661a3e87f2c8e969c23db1e94f561b73ca7beca8eb253f047530eec0791e2eb1
font_02_sfnt_off0000fe63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 11428 bytes
SHA-256: 75410b98b2cbc50a1f7b4292dbe496a32835e136209cafe8697f04073659c5de

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