Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a91a18b3e8cfca4…

MALICIOUS

PDF

84.6 KB Created: 2021-09-12 17:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 13cd650a5d3af8439f143e5213098d0d SHA-1: 46957138f95c4b4d1fb9a49a6e8def78697336ab SHA-256: 5a91a18b3e8cfca43f5f8503b4ab286d496211aac3508891b959655094501259
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to redirect users. The presence of these links suggests an attempt to lure users to malicious websites for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=google+play+store+download+for+laptop+windows+8 PDF link annotation
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/5b667f108f036961ab4944533562a81b/61818513951.pdfIn PDF document text
    • http://kadet-ck.cz/pic/file/83375137937.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/89916039618.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/90364231733.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/zajororem.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/jizoboretifasi.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/95269574688.pdfIn PDF document text
    • https://path.mn/userfiles/files/sipusololilaguwexefirej.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/82603460278.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/vosew.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/nogageteza.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/loforexo.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/70089509268.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8fd731521---vofedojuroleresuxigobos.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/geluneduniboxawafovek.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/q3uf1pmg6bpfmpvf5nna9vi2a3/kojudepirupuzapoxokeval.pdfIn PDF document text
    • http://baozhaopharm.com/upload/files/53225431539.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/65731067748.pdfIn PDF document text
    • http://farashimirooz.com/files/sufitodizuxibumugimopi.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/nojebugovazu.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/9a547ddc9d831454030e1fb91734fa99/keniraf.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/12677043781.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/xamujalufo.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/guzim.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_off0000e577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 11120 bytes
SHA-256: 257192f96227bbd5f7ed9dbddf8d6d3119a234443ec572e04edb41e0dfa33e02
font_01_sfnt_off0000ff7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7D 17440 bytes
SHA-256: c6bc35211573274ab2e34e8774a4aec6d74e16caec712a5217ed2129ac3278c7
font_02_sfnt_off00012c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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