Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcae6a420df905e0…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 14:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b24e21cfdfa6dd08941810d19125065 SHA-1: b3377ed2f67ba569c0519041a56de8905fadd564 SHA-256: dcae6a420df905e09b0ecedf306fdb1d6c6c76004f63751413e014c0be02b00e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a phishing or trojan payload. The document contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://leosservices.com/userfiles/file/71173669752.pdf In PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/18546198523.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/bewido.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613edf63948bd---kevomomobit.pdfIn PDF document text
    • http://mariancozma.com/_user/file/vopabomafizozutebuje.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/3984828487.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/61957843789.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/5qldga04m1c4t5f45004tmj3h2/96420053765.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/8713711802.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/6de7938db3a3a7f05200bcfc3e641460/92539522193.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/dasibi.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/bunugilutu.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/pofefulupoduzobogaxas.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/jojibomefebefutedewixuwu.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/tutezigalopopodifepa.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/bofejegozoxujola.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/purorimut.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/zupukopofejojozonizizip.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffd2086b3f---58793106380.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/kokijezo.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/gukufanipuvoribulov.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/divavevamigajiparobajoli.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/sevuloxowisixepajisu.pdfIn PDF document text
    • http://hiniceshine.com/upload/29379050562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gta+san+andreas+codePDF link annotation
    • 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_off0000e257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 10264 bytes
SHA-256: 21177d60d4eed5219534410c02d83e6061c7aa75d4a3e19d42d2dfd10268baf9
font_02_sfnt_off000111ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AD 17780 bytes
SHA-256: 4db425e9668ae6275cbc0ebc987290962413cf5b091bc7be3f9eaa41cbed73b1

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