Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ab0eafeb821ad4…

MALICIOUS

PDF

70.6 KB Created: 2021-09-17 10:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 937b09963f1b65eb95262b30dba29adc SHA-1: 44b513ce1c69ec26ac03010f650060895ea6733b SHA-256: 38ab0eafeb821ad46b55ef24ab51916a692ad9027f5bb5c57a8bf5f4b1f50182
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially malicious domains, as indicated by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the overall structure point towards a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

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://pixomot.ru/uplcv?utm_term=yu+gi+oh+android PDF link annotation
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/92479461207.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/40216550429.pdfIn PDF document text
    • http://epmachine.ru/d/files/20222117016.pdfIn PDF document text
    • https://mimpishio.com/contents/files/23814625487.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/luzutem.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/woxota.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/babemaxixi.pdfIn PDF document text
    • http://artbaget.net/admin/ckfinder/userfiles/files/49699157505.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/wotekoxe.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/75305414026.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/16572930458.pdfIn PDF document text
    • http://twilaw.com/files/files/gamunogironimutoxefa.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/8c3b3050af08b0736ea31cb47e29ed29/lexorixopuvuwonelugidutez.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/89288315892.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/59699125305.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/93182968490.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/zarubaruwixuvibavuve.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/79851366514.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408fcfd3a62---musogutojajoduxizepemurus.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132c959b327c---17809491074.pdfIn PDF document text
    • http://cke.hk/userfiles/wanawu.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/21215580711.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210903220454.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/82390571278.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/gogisoruboxusananebor.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/sipugitobupixolobogunemo.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_off0000b264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7B 10168 bytes
SHA-256: d59f210f86a0ee10b78ee277595de9a4f6efcc131c2e78e2962cbc89f60eab85
font_02_sfnt_off0000e0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D3 16908 bytes
SHA-256: dc26f6caf51c198439cb5598ae07b0ead351d5d11c45bcfe6b684220b5fd2111

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