Malicious PDF — malware analysis report

Static analysis result for SHA-256 4604a23a3627aa89…

MALICIOUS

PDF

74.9 KB Created: 2021-09-20 15:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a58a0c0ee27b6ff73ddc809348e6a2f SHA-1: e2a596a1072990f3c97fe7f20edb3554eb6c32c3 SHA-256: 4604a23a3627aa8936e2602703099a726555f23334ae414da7d30de68cbdde2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, many hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. ClamAV detected it as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were directly extracted, the PDF structure and embedded links suggest it is designed to lure users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://garglob.ru/uplcv?utm_term=toffee+smart+tv+app PDF link annotation
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/f70150b3825cc11ae0063f5d9716ebdc/gonomawovesiz.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/47273864138.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/vibedaroxo.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/8458c443df40c4b6d7d0992bbb08222f/pazoloxolukozibiz.pdfIn PDF document text
    • http://ustunongel.com/image/files/lopenexoki.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/liletevovotovevumizavit.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614815d84f7e9.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/65098024942.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/86403645547.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/2353069814.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/81b31336a9d79b77868c9390797839d1/74708963155.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/25859114227.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/javewosinojewanogo.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/7611830513.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161445cec9afc7---nirotojonexofopuxeker.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109030602323455.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/17202748178.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/73299184327.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210905115655.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/95de53482e462a7bed91062ced828d18/8147814808.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4b329baea---30852714331.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161388eb25aef8---63912821276.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/1881749851.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/37630399768.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210917_F3C461863B3D3269.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/4691980837.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_off0000c49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49A 16344 bytes
SHA-256: 14d8c4771cfb86a7af439306fb0ca6014fc0c6436b8a52758854746bd17d23d5
font_01_sfnt_off0000eea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BB 10304 bytes
SHA-256: 6e347636189a4ea018d80c2a8699b11733b7252508fdb39e76a998ae256c7efd