Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0b437d1f671a4b…

MALICIOUS

PDF

77.4 KB Created: 2021-09-18 02:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2348c8977e1d5b1bad8ce4345c1b605 SHA-1: 94a414ccd4a1c294fe795bc8db591b7d592ae34a SHA-256: 5d0b437d1f671a4bcb8a49875bf71878c3ad15930d46e78cadb69a23b0c522e2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous external URIs pointing to potentially compromised websites or disposable hosting. These links, such as https://medvor.ru/uplcv?utm_term=install+beetv+on+android+tv, are likely intended to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://medvor.ru/uplcv?utm_term=install+beetv+on+android+tv
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/a1uorc470vuvovaic2jgpmn7d5/3765634869.pdf
    • http://weilandvloeren.nl/fckimages/xozuvubosesuro.pdf
    • http://i-dron.cz/data/file/favaseju.pdf
    • http://oilspecchem.com/files/56640971018.pdf
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/18928863919.pdf
    • https://barrier.exma.cl/ckfinder/userfiles/files/wilirisetitikabapexutigo.pdf
    • https://receptabc.hu/images_banner/files/xafajukasoridi.pdf
    • http://ngnjl.com/userfiles/files/81091475066.pdf
    • http://anabakorea.jp/userfiles/file/81396336432.pdf
    • https://motiwalainstitutes.org/userfiles/file/rezawalituxigupava.pdf
    • http://sharon-barron.com/userfiles/files/noforezat.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9638054b8---masenakedibeb.pdf
    • http://hanilkwanla.com/uploads/files/64050949643.pdf
    • http://mannaz.pl/userfiles1/file/45757272364.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378c8cd8d6b---jipowubinefuwowapid.pdf
    • http://orderleesushi.com/uploads/files/vepewomigekonijikapu.pdf
    • http://designerhouse.ru/upload/files/32029098994.pdf
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/fadukemogole.pdf
    • https://ikorti-iao.com/userfiles/files/rojoxiku.pdf
    • http://captaincook.hu/userfiles/file/lejupisa.pdf
    • https://dom4m.by/userfiles/files/guxupukox.pdf
    • https://cicadit.ro/UserFiles/file/75776449199.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_off0000c946.bin
609243b45822c5808c4bbedf75c77479d9b88544badfe8b50bf93a0aca7e3eab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC946 10396 bytes
font_01_sfnt_off0000e0f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F0 16792 bytes
font_02_sfnt_off0000f902.bin
2afb5a84e566ff4ab0adb5bcb4656ec638babf23c372969cbb5fbd2d8545f246		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF902 18300 bytes

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