Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cac6260f9025db1…

MALICIOUS

PDF

91.1 KB Created: 2021-07-06 00:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c75564eeabfd63eaa74c55702f6b31fb SHA-1: 26679d8a30d3e13326aa2940b27990248f5c0653 SHA-256: 9cac6260f9025db1224939a75df58804b971392304c4b18af8ed6e4b5070cc48
156 Risk Score

Malware Insights

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

The file was detected 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 compromised WordPress upload storage and other disposable hosting sites, likely for phishing or malware distribution. The presence of external URIs and the nature of the link farm suggest an attempt to exploit users through deceptive links, potentially leveraging embedded JavaScript within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://allytemp.ru/uplcv?utm_term=scientific+knowledge+meaning
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160748785582e3---3535034020.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e376a51321e---wukodurev.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aff5c8317---95066623675.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/b9f62ebc2aad5e007e1732448fc51490/wegafepufotepob.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/admktvc5p7ebibdl997cvko7j6/sominuxu.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609be6e6da392---79797119062.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1a9e5490---minesafetatuv.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d74ffd34f96---74143871958.pdf
    • https://mariapolis.net/ckfinder/userfiles/files/54149340496.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/lovanekezetusos.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/473c828c72c80d7aa48dc3d025a290f3/babesejorejafuwom.pdf
    • https://bnbcostaverde.it/userfiles/file/61578851545.pdf
    • https://eternalbliss.net/file/83175489498.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/e0d5f3c53b71df7e0b96a8e9d028bb76/93496979254.pdf
    • https://salvatoredivilio.it/userfiles/file/wokexawudupazominozi.pdf
    • http://guides2alpes.fr/uploads/file/76850319418.pdf
    • https://questyme.com/userfiles/file/kosozasodovajazi.pdf
    • https://bachson.net/upload/file/19221983536.pdf
    • http://www.ecvbrass.ch/user/web/file/35394189574.pdf
    • http://aire-limpio.com/img/editor/file/fonedeniwikazire.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099eae3cfa4f---64776274070.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc072b22a7---deputetatatomag.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fec9.bin
563a137657bb589b878ba5bdde51eadc889471f3caceb1b1007b9ff4c4789255
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC9 17440 bytes
font_01_sfnt_off00012ce2.bin
f10593b3c766e332a006c87aa7d2e8af701e7fbca15aee6d675fb558f9350c04
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE2 10804 bytes
font_02_sfnt_off000145ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x145AB 16792 bytes