Malicious PDF — malware analysis report

Static analysis result for SHA-256 75de387a60434869…

MALICIOUS

PDF

70.2 KB Created: 2021-09-15 20:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 334353f86782b23e7cad81b5272fd991 SHA-1: f5bea99051a5f6c1f8a1f93dea6e8487ca39de53 SHA-256: 75de387a60434869d92e29df8d8c6a64de8381558ac5dae42cc64518133e9662
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure suggests an attempt to deliver a phishing lure or redirect to a malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://odontoflash.eu/userfiles/files/lamobilezogiluf.pdf In PDF document text
    • http://s-privod.ru/userfiles/file/79740513886.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/93284265818.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/dusetefulikuterijodumiduj.pdfIn PDF document text
    • http://elskenecologie.nl/files/77841746880.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/80921964111.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/99729790941.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/37941491125.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/5t59eq6ro72gj88sq7agve22s3/vimuboguwotoravenoxobe.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/fefusujinekuzakaxefeg.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/68475240577.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/xojopuferiwofoj.pdfIn PDF document text
    • http://dges.in/userfiles/file/tinitanobobawaxuvepaverot.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/wugidubabipesupiroxitupok.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/24503126831.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138209f58217---55881595080.pdfIn PDF document text
    • http://jaqalsports.com/files/file/68482873098.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/batalasamuj.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/nokunakadej.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/botimelilugerebened.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/36c17553a066ad2fb6e9e4f0ba9f0f46/32793106448.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/nuvanevivexuvuxubowiziduz.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/jotepakalutegudibimexe.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/50815762378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+password+protect+a+folder+in+android+phonePDF 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_off0000b43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43E 10796 bytes
SHA-256: 9137410c8179cb81f43be989ffeba2f705c7c63a4b43cdce7b0115cfd467ef52
font_01_sfnt_off0000cd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 14956 bytes
SHA-256: 1ad5e24a42d0275a2861246eee1b8b066228964ed419437d1cdd7c81fa08e224

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