Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2cf922c613dd168…

MALICIOUS

PDF

131.7 KB Created: 2021-07-01 22:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8915bca2d77c3207cd2ad13a22121921 SHA-1: 4d80be72f3609c7fe4636674e529dc06f781fe5d SHA-256: d2cf922c613dd16840078e0608040cdf09dae23a138103f032165053d6b14000
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of multiple distinct hosts and the use of disposable hosting suggest an attempt to distribute malicious links broadly.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9631

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://akinmedical.com/uploads/file/81110039206.pdf In PDF document text
    • http://yasaitogo.com/uploads/files/vatimosemopokukosugewekot.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/36c949b9367cc448b745bf2225373bc7/24276537892.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/31296855867.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/2s7dd48jqprbuql5mojrk3c6b0/kupiwurulu.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/f170ba833c75f0624c8c37f4faffe036/parixi.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/c940ee6fb1aceb1a5b825836c2175aa0/70218152314.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/6649da9eeb09fe16c0c73021556e63e2/53645406841.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0aba52f6b---muzojinovilefe.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/c1c9051ce2bd02324a05d8805c892905/70696291867.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cc3d8967b---48427285079.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/50532894768.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/b66e7ea616679211088e4baa76f44110/nanumewokivuzotadis.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/4f65dc1e721cc7e3068920835723c469/38612850889.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160817394388ab---kenuborepile.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/3baaa644dc5885213e61244f4db2744a/dumubejowopow.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/4156f37ba10342d5547d307860495d69/78959031069.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/90169847123.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097959202b79---subavofujafagexirole.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/xugofo.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/f4390b923231b10eff42a82f53c54906/55073390119.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/gibubuwep.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082a60f7df12---wapomizanowobuxejipikok.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/kibazunufitasanilisat.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080694d14754---dovimubiwalubawe.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/0f41769fcd5df4f10d341ea249940b89/bupurabodogupunegel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=all+ten+tailed+beastsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16938 17520 bytes
SHA-256: e00ea7bee314cbc3e5d5c0bd754e8283e9b4b20a27f9ea277f6aebca87e13eb1
font_01_sfnt_off00019663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19663 10144 bytes
SHA-256: e3c86325c82ad04a1f2ca4541b7d98b65049615b9edd638669a405ffc8042979
font_02_sfnt_off0001ad28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001c536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C536 19288 bytes
SHA-256: 5d127cd903ee8313787b868e6afdae0ca5e96ba2b71d14d046bb634eb4dee871

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