Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a871c7cdc80d50…

MALICIOUS

PDF

154.0 KB Created: 2021-07-18 15:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 903e9c517c7a46dbf650e9d11cfd7a10 SHA-1: dacc7bf1f80db323be8df3fd82ddb9cd36c84735 SHA-256: a5a871c7cdc80d504aeff3de053c6b77e53eafa98052e7b09345fcf4742209d2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to obscure the true destination. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. The presence of a link farm on disposable hosting and the use of UTM parameters indicate an attempt to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b72d25b6d2c---12290162700.pdf In PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c6e2808b84243352fe66c7b8f861ba0b/koxidozofebevemipi.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/63087309544.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edecf6b3f32---lakokerakano.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/ligogowepojewurolugur.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40ed390513---wifozejumer.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/nidezubaxibiwunipogu.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/74692383161.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/c1f25d76d511337aadb07dac6373f3a2/somurifaxopapeses.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/linopogemunitav.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/c20e0ad1f1c49141696a1b56e9f68bb2/66437067717.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3de93df210fb340928c865847ab934b/jolusedeju.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/22605202320.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e56571f06a---70982660806.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16077d86497e22---67621403087.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/19463928958.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/54951339078.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff3b0bb156---66558793533.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/regatiganabikisuriz.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/cedeffea320423d367b7e0b6fa481042/57020079460.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/vofogojuzasog.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/5e3b859093f665ddd401526b21a792e1/50660852044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=conor+mcgregor+fromPDF 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_off0001f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F091 10144 bytes
SHA-256: 8101b0420cea2c26990c2849287a9fdfd8dd230dfe737bb603ec179a548b2316
font_01_sfnt_off00020732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20732 23152 bytes
SHA-256: af87de04e1b1d21077b06d47d32e53a77627b935e05398fe936c5f0d88eac5d1
font_02_sfnt_off0002415e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2415E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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