Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f1e50df77bc84d…

MALICIOUS

PDF

82.3 KB Created: 2021-08-20 21:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 17c0437951af37e2c2181e4b128d04ac SHA-1: 99ec88c8888d3c7df6f5f06f1ea8d59d529b1ce0 SHA-256: a5f1e50df77bc84d64b43f432bc818a87d445d24a2c4f4dd8607a908dfda75db
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ML classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to facilitate phishing attacks or distribute further malware. The presence of multiple links on potentially compromised CMS uploads suggests an effort to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://skupka23.ru/upload/m/dijugosupokev.pdf In PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/1gsummc8h75a2btsk2n9pmnepk/36702606771.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/de3av1ji3eo8ru721b043pc7ej/kodenarabafusugolegedav.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160abf5debde8b---28393762569.pdfIn PDF document text
    • http://aweibel.com/Photo/file/39891337327.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/5d4c20fc1d720bb52228a9975921dc44/tobufezotagibasosoluza.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/kelavuralasuxawefit.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/39103996926.pdfIn PDF document text
    • https://schmitz.cz/res/file/dotuka.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/20145871437.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/21001803095.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/08477ce88033ff6386c434cc074b8d2b/kazirobezanum.pdfIn PDF document text
    • http://jucal.es/images/file/43092878724.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607502e132ce0---68509793681.pdfIn PDF document text
    • http://pnalog.ru/images/file/xuziliv.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/romazikemezoxinofixujek.pdfIn PDF document text
    • http://tfforming.ru/d/files/tumezadusedopufiligirazom.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/tazojoso.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/97786922795.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/a42976f1e723660a275322bc95e4728b/90640558608.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/worololepokikuxazugedegi.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/00898f7965d2c79d8d8f0db18823a01f/notapowokizuvasi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607820e89f80b---2529238030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ap+psychology+defense+mechanisms+worksheet+answersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 16284 bytes
SHA-256: 0ab894711443a03458294630b18bbb2bbe52bd62a01f6cc2e2d6c96eaa0927de
font_01_sfnt_off00010698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 11340 bytes
SHA-256: adb36047a72fc2f0c2721d69dd512f0fd2de8c2c590eea567289c23313813354
font_02_sfnt_off000120ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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