Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b754e5af67342a3…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 05:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 887028cd18277e7062a07b9980284270 SHA-1: a1ff031787cca6984ce6603fd0b53519d26a9eba SHA-256: 7b754e5af67342a3036436712e73a753af8ceaf54cf4e2391a9bc8ca230905cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable domains. This suggests the document is part of a phishing or spam campaign designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=how+to+move+pictures+to+hidden+folder+on+android PDF link annotation
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/eht4p5332q1glhgv8mco67j6em/73723900664.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/midubogosumiga.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02fb17b93---lewujo.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/54720575821.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/nagatoxefokemen.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/05/file/20210905_185857_111.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/92470510727.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/kibebekoripuwumasivow.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/gefazekazavanoma.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/daa97de8bb4700d8981ba54926dc5f6c/sovulamumidomavazona.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613170c646c88---ruxusakujil.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/8409003498.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/30349591998.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/fizidirilo.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/l44oaiqgp9540ggh50jpbh9ndt/45417060485.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/32289795092.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/64083052323.pdfIn PDF document text
    • http://rld-carbon.com/file/gukidikefexoderajuji.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/65077761390.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319b21975ff---dubifabujitotariro.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/50146337222.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/xekuvamevakixudejarimav.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecd0e73bb0---xolivadumimo.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_off0000dc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC07 17592 bytes
SHA-256: f2e60682e926f86379cf83e077a6c51f688475c9f9af6fe46f963e6ba9a20c4e
font_01_sfnt_off00010975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001218c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218C 11128 bytes
SHA-256: bb445bd7cf2ec8656083bbf65fc980c1386fad7abe1b299370c37c12e8e6a247

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