Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb05a577e70971d9…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 03:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d5f315b3fe2a53dfb5ad34729c40080 SHA-1: f34cf32bb3265be95aaff83a0785e9f198242358 SHA-256: bb05a577e70971d9fadc9ddd19cc671341454e3e22808b6c5d25cca2e58b8ee8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with ML and ClamAV flagging it as malicious. While no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristic suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://crewmak.ru/uplcv?utm_term=adore+movie+live+stream PDF link annotation
    • http://aow.infogestnet.it/ckfinder/userfiles/files/17720486560.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/mesakuraxerusetiluzojan.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/jodup.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/nugefo.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143122c3138e---3469229448.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/xowewerak.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/vakiguvapesumezurimupid.pdfIn PDF document text
    • http://cke.hk/userfiles/97330542900.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/33622583466.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/98128900192.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/98026537285.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/8bf2efl7qsmtotv8ckm8bne0d6/376612208.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/5565836950.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/xotomeritexixelubusog.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/82632988317.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/7e8eadb18e5327c310f610641a0bdc15/baxusogi.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/92576355373.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/54114704847.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/jaloxip.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/kalenab.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109011719167823.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/60102304517.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/jinividoxekisubijutegopo.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_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 17476 bytes
SHA-256: 547cfb39b675a0f73a560bc98261eafaf3e9abf1fe6e6e069c6c473d1d98fb7a
font_02_sfnt_off00012376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12376 10352 bytes
SHA-256: d388d0d9d55029b5a377c6bc00fcaa876ee7863ea352bd284a0e30a5431d1cd5