Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f2fcac1e577770…

MALICIOUS

PDF

76.7 KB Created: 2021-07-01 16:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9fbf7607fef417298398e1b087abfa33 SHA-1: fab91796838e2ce8370bfb6f7433426a80ed1c13 SHA-256: 94f2fcac1e577770488f9b345cbeafda6a6bedeac25457243875f2f7a0303674
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to other PDFs hosted on compromised websites. These secondary PDFs likely serve as further stages of infection or phishing lures. The presence of multiple links to compromised CMS upload directories suggests a pattern of leveraging vulnerable web infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b30278626ad---18396242387.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/lilikemelinesegolobalu.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/3f14fb08bd2e8be109140220cb2ea3c3/76684302709.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9462e6e8ba---wisumexopomakusip.pdf
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/36242039582.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/60971f09ab86c6e2199733ce28d448ac/38638555637.pdf
    • https://tezerwatch.com/file/upload/files/06-11-15-58-49-55.pdf
    • https://nestaerospace.com/uploads/file/tipomenosizodudusodu.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b0e3ea60a67cfce828830916ad737001/1764196040.pdf
    • https://bbpartner.cz/userfiles/file/36931235752.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae6ca3f4c0---52828239911.pdf
    • http://10glazsikeyrosa.ru/file/43339870742.pdf
    • https://stijsr.com/userfiles/file/34782696914.pdf
    • http://slsnn.ru/content/files/74521239119.pdf
    • http://rajhansnursery.com/userfiles/file/13355659186.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/11b7de5e5e2cbc544049354f7f82034f/jizoratatona.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/a4bac889d1e9f85d1a09753bb75a6315/jujibenisonebilez.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/04a12ffc6956e603093f5302c591c49d/xovebujamo.pdf
    • http://goldmustang.com/files/files/13860744230.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb408be818---wexuworo.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/nvau5bvtjsigihcfsbifnfm8q1/lixedinadawixogi.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/daussso2q4m4846nu23nc9uss9/rafalidanatiz.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffc0d90f5b---57759098696.pdf
    • https://kisikana.hr/userfiles/file/gukuzoniwapuxasogolojoxa.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/6f0a940f308f7540247a885c57b7bb26/62776054346.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9106ade3e89e135ca8642dcf99fb1258/noguseruve.pdf
    • http://archi1919.com/smlclub-files/file/85788922980.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+count+the+number+of+sigma+and+pi+bonds
    • 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_off0000c522.bin
390988ea5bcc779ebebdedca7a711434f4a34c0167b0745052f7af659a60abc1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC522 11336 bytes
font_01_sfnt_off0000df2e.bin
cb7defd200bc25779231e297cf4376b5c976702486f17291427737f5fd0976dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2E 16732 bytes
font_02_sfnt_off00010ad8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD8 16792 bytes