Malicious PDF — malware analysis report

Static analysis result for SHA-256 558fbd15429213a8…

MALICIOUS

PDF

95.4 KB Created: 2021-08-02 13:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 212ca6ba142f5ef130317bc55b06ed6d SHA-1: becdc6e13625e28681965da475daec0ebff0fcd7 SHA-256: 558fbd15429213a835e69796d534683bd13119a051670a2b6dc34acbb9f33e3d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing links to compromised CMS uploads and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs likely serve as lures to phishing sites or malware downloaders, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ketchas.ru/uplcv?utm_term=solucionario+resistencia+de+materiales+beer+johnston+5ta+edicion+pdf PDF link annotation
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/m04mhqifp78fvdou8a1vdq36e7/sedumekafabawubawinelovi.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/57366385635.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e2f6919e56e---80306516467.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ea78e6564fd9dba83e0fcaa3e91ab847/17622144357.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f083c15de3---40380673859.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/mr92fljts1c6k19gll6qj3sb7g/gorolitaxireki.pdfIn PDF document text
    • https://myhoteltrip.com/userfiles/file/mijixubikex.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/lotedif.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/rajojaganolonilikowebado.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/7401450207.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086bcbee3ad0---lafukitipimuvujomuzid.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/66759023238.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rhgje6l3qcbg66sfilnbsp7k90/88770791482.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/13468385846.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59bcca5a25---25345365067.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e6b801d80---dupudilibelo.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/5fd9623cddbbc80b751f2f99dfeaed21/sizivosatuwavuzotefasopi.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/biwozitabidisupos.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/gipufujumujukediranok.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/xolebikavufaruxebulo.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75288eea9e---65815505991.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/juzabatopalebojevof.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_off000108d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D8 19232 bytes
SHA-256: 644d9d725fd3793bd61a5be0f684e0b5347aa45b4ccce9e2ece4e34d549bd5a5
font_01_sfnt_off00013a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7D 11464 bytes
SHA-256: f8241424874e7797f7b1a6ee4476a19df2deec5a50f3a9f534dceaadf3ebcf5c
font_02_sfnt_off00015527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15527 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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