Malicious PDF — malware analysis report

Static analysis result for SHA-256 605d6314150321f9…

MALICIOUS

PDF

90.0 KB Created: 2021-09-03 18:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b1f78cd0927a137a5a850157c4024731 SHA-1: bc3b04053869d0c32f64845f3561735d08a2659b SHA-256: 605d6314150321f9648203c4e054b2567eb6f349a5e19a696933fd657d494b67
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to unknown PDFs hosted on compromised CMS upload directories, suggesting it's part of a link farm designed to lead users to malicious content. The 'utm_term' parameter in one URL indicates a potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/6iq13bilbunceov0cj4i8ofrpj/5173097320.pdf In PDF document text
    • https://bamfieldrental.com/userfiles/file/1706849119.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/615i1eb0uq0ro115qsjdcgeqdu/fudavakisigote.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de69d02b3f4---lujafemefodidanobezob.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/juzusiv.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b38a4c0a61---56917666031.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/51612272968.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/tinuduwemovaf.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/duxod.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/benirige.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/xezetirilojijiravakifi.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/dadap.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/lexirowadopib.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2c600e024---28415239858.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/ded766b77d5a131c9ede5a149bd6679e/fupek.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/dca761252fe7b42219422558090f1808/wujegax.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/tccmhsua4utvifgs913t8oniqt/fadog.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/50133512604.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/ripado.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/gakebip.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/miwevisijadokozesoboba.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/vesilofilubonizupowutuz.pdfIn PDF document text
    • https://binhvi.com/upload/files/wugon.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/06/20/file/20210620_121401_184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=thumbelina+short+story+pdfPDF 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_off0000f450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 11080 bytes
SHA-256: ec00fe6046fa604c84faff42b65c03b6fe622a3320ee653521b51f50beecf39c
font_01_sfnt_off00010db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB7 20540 bytes
SHA-256: 1e542327aff27ca2c5e72e59a9661d408ac470e40014e5f25a5edfc53ef0b841
font_02_sfnt_off00014266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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