Malicious PDF — malware analysis report

Static analysis result for SHA-256 20752d7e2d72b75e…

MALICIOUS

PDF

98.9 KB Created: 2021-06-29 00:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5ba48ff4d3f1746fc7e4358e85023b7 SHA-1: a0d80111bf069355bebef857f2fad0bdf5d9cb24 SHA-256: 20752d7e2d72b75e92e98b376be78026916e09150dfc75fb0500eb6c06ed33be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=complement+event+in+probability
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adb58c15f91---madinopufamufup.pdf
    • https://giverny-bkk.com/upload/files/92662709109.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160788ff67426e---20818360386.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/44da73e01fb067a04c0b90bfbf231501/17066689137.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c468f64293---98605152915.pdf
    • http://esoftland.com/userfiles/file/68135350759.pdf
    • https://webmenuplus.com/images/file/jaligufotizipi.pdf
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/82437439047.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160837f743bfc3---zotejexajufatas.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098289294d86---70341664694.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/qng8ph901l8273j0tmnavsdhil/folagol.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a9c8a77fb0a49572022e4bb07df158bc/45146568180.pdf
    • https://balbok.net/admin/ckfinder/userfiles/files/zofutodivowu.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/86kupqb79a95abcbu445vdn143/vonubufix.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/4acc0e95e648eafa0263d5910da36803/limijinodo.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/sqdk7irmqff1bfkpjmpc6l2287/tolovusetalokujuzep.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/2k70kb5mossh8ena8id7ijbeul/mipotefabi.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071531ce0730---38196855415.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b9b733a19---sivaverepuviralu.pdf
    • http://ezibra.pl/upload//file/bagazupunagumemesetadebun.pdf
    • https://actorconseil.com/files/file/17058511394.pdf
    • http://circuitoinsulargc.com/documentos/file/fezojamixudurinofufutoni.pdf
    • http://archi1919.com/smlclub-files/file/boluwirarenebodowobuloje.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608526b3edc32---64420164940.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_off000120ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120AC 16792 bytes
font_01_sfnt_off000138c3.bin
cd5f79b7d87e1ed36645d75aaab0e5aca33bf212d9a4dfcb3d2a45c373584ace		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138C3 10596 bytes
font_02_sfnt_off000150b3.bin
2eb48ac17537b4464d01f1969312f6fbb5517cb86ef25fb58c96d1c424c072e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150B3 17316 bytes

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