Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fae880203fa209d…

MALICIOUS

PDF

74.8 KB Created: 2021-09-08 00:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 96ee113f552b5d8c78a496c84339e129 SHA-1: 79675a35cc6e0cb8719b9e066695b029a821a510 SHA-256: 4fae880203fa209da8eb150ecd4186e8a0316018b05df21f65bda2387fedf93f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm containing numerous external URIs, many hosted on compromised WordPress sites or disposable domains. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=citroen+relay+wiring+diagram+pdf PDF link annotation
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/9b7ab616b43f71349a821d16d305f941/88819301926.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/mifetozukopifot.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/8iec27qr9sj2s89nk9higqtmb0/47866944449.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/dagezazabotenejevamutixa.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/lalifevuter.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/navevilijabafapuse.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/52334c3d79ce17344ad742dac1cf12aa/32145084073.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/koxupowepuberimuvawufulom.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/9853888527.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/775ce01e8784ddf7540b5ed0b34e812b/tudapevoxofekuwenodemefo.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/poxixolikebupi.pdfIn PDF document text
    • http://sbcnepal.com/images/file/jazobaxefexiru.pdfIn PDF document text
    • http://www.heksan.com.pl/file/60011620699.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160727ab781ae2---xilodetujepu.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210621070045_1603043295.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/dapidufutanila.pdfIn PDF document text
    • http://monroe74.com/clients/871877/File/58794434207.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb780e2474---30925197627.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/c29c479a54a36fa9c5b456ed90e0309a/1045837337.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/zubebevodakatigogepemenil.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/22123112605.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/72084753235.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca51133f37---77442250229.pdfIn PDF document text
    • 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_off0000c449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC449 15748 bytes
SHA-256: 9be797c7cd70dd28fcfc17bebc5a2c48fa28fc22701bdd679c2d27ba207f7c09
font_01_sfnt_off0000ecb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 10904 bytes
SHA-256: 5c845f7689e66e336c4c8ee9a8a166b1c51c6acfe3e13fd38db433833e4ddb8a
font_02_sfnt_off000105ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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