Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8f97ffa2761ac4…

MALICIOUS

PDF

84.5 KB Created: 2021-09-09 11:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0878ed2b8b627681f29f0bda721b4752 SHA-1: 921f1087646794605b6c090b6641b12a8fa313bb SHA-256: 1c8f97ffa2761ac427d221736fde3f35d6db593781887389f05bc0380b125f30
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm. Heuristics strongly suggest an advance-fee scam lure, where the user is enticed by a prize or parcel delivery to download further malicious content. The embedded JavaScript likely facilitates the download or redirection to the next stage of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46507829168.pdf
    • https://pchome.uzai.ca/upload/files/99258845300.pdf
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210904090421.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16138a41312603---wivagosagakerotirileli.pdf
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/78759044515.pdf
    • http://bsbcarpet.com/userfiles/file/87464655285.pdf
    • https://vsevolozhsk.mebel18.com/uploads/files/dazisixerepukuwebidanan.pdf
    • http://baracenter.be/userfiles/file/50824141022.pdf
    • http://sumosushingrill.com/uploads/files/4288212850.pdf
    • https://ofcourselc.com/admin/uploadsfile/66777637076.pdf
    • https://udruga-invalida.hr/files/35688194581.pdf
    • http://osc-pribor.ru/products_pictures/file/38067257811.pdf
    • http://anapharmata.hu/ckfinder/core/connector/php/files/99337102379.pdf
    • http://duhochoangthanh.com/upload/files/65931343152.pdf
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/24088260125.pdf
    • https://whereestar.com/marinarubicon/admin/file/dilusekiratu.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8e4e83b93626080b2cd97cfe7bab57b3/jetuloluta.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/5bnrru0b57umqisdbn59h15mfq/miraginuxabutemidiwefaxo.pdf
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/36168708280.pdf
    • http://savytrading.com/userfiles/file/govonogetomaxijamadodanir.pdf
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/15383666522.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=find+android+phone+on+silent
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e677.bin
1b188136e560743d146a37dd7f86be76319efceafd1acd51d26c6e05a8f0c643
pdf-font-stream PDF embedded font (sfnt) at offset 0xE677 10464 bytes
font_01_sfnt_off0000fe11.bin
1d653fef4d9fadef70d75c539c595546361120a8cee3a34071c9273754169449
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE11 17656 bytes
font_02_sfnt_off00012c4d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4D 16792 bytes