Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a4be0fa80e3eb8…

MALICIOUS

PDF

86.6 KB Created: 2021-07-25 13:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c11360a800e99b8a1bd776905cf45e4 SHA-1: e006e561115cb917c6edfe73ec61f99c8b49b2ef SHA-256: a0a4be0fa80e3eb8433263dbefb20c571e32ba5b9a34f584d854ab45def0d34c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous PDF files on compromised WordPress sites, likely to deceive users into downloading malware. The presence of multiple unknown URLs associated with these compromised sites strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3fd4334de---vofikef.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/272c9fbfef801912f440070a9d075be7/79785372686.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/56211701404ea652318f47853bc714af/nanujigenad.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608655c7cf7a2---87077118110.pdf
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/disasifefufedujigo.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4fd3238d10624fbacf1e97b4b0abe3d8/mikogujatowifuzexu.pdf
    • http://gloucesterclassof81.com/clients/23558/File/82777635033.pdf
    • http://dolphinegypt.net/userfiles/file/98172281507.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/hvqjtl9or30ilkc4it19sgtvb7/wusiviserobevevogafiribi.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2a93ae86a---dasezagir.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/d24e4849d5dffef14124005766b3e707/nozobiv.pdf
    • http://csc0311.com/userfiles/file/20210613161752_2w1ge8.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/772363829dff3f6620e89b0520059b56/xizirenire.pdf
    • http://jinistudy.com/_UploadFile/Images/file/89379599650.pdf
    • http://star-transform-moscow.ru/uimg/files/fexotogup.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=download+android+studio+32+bit+installer
    • 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_off0000efb8.bin
bba3785017ca143b36a10ff98cec89bafdf92697c893ef93fa5db5edc1f4a4bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 16756 bytes
font_01_sfnt_off00011b51.bin
72626fb0d3d85ca8a64867a608b6c6ff90cf6a03e6c502436ba3f23374651da4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B51 10860 bytes
font_02_sfnt_off000134a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134A8 16792 bytes

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