Malicious PDF — malware analysis report

Static analysis result for SHA-256 01832f66fa9ea161…

MALICIOUS

PDF

77.2 KB Created: 2021-07-28 03:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 491e2ffcfce0e6e50fbd972b26669769 SHA-1: 607eb0211f43da4d722db543ad6014d79292ae41 SHA-256: 01832f66fa9ea1612ddab104ce781884c0727ec53089ab1753e9ac7558f580f7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple domains, including compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination or leverage vulnerable sites. The primary function appears to be redirecting users through these links, likely to a phishing page or a download site for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://baongochoa.com/upload/file/vegawazoxujekaxewo.pdf In PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/1813fc22dtbg4lj8sqf9hu2982/55937624095.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608029b6bbe57---pukobikipawiguxekija.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-12/20210612030631691353.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///76681294494.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf60cc45788---banuso.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160745049738d3---lenododow.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec7003b577---xafuruvuxugubavitavud.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/d74e08e8176c18330130b5d2ffceaf26/66347088456.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/57234553346.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9df93893d---23593358824.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/77560258392.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c49da64bc---39713304267.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c2964e095---dazidazafukitan.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/54088820576.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c163e85c527---walus.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/sekebani.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/mivujoxatukasapolebalo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8030173b98---karefanedogaxemulepajifez.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/99300669883.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/fopul.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/74620172747.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/begawisavasafexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=%C3%A7%C4%B1km%C4%B1%C5%9F+perm%C3%BCtasyon+kombinasyon+olas%C4%B1l%C4%B1k+sorular%C4%B1+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_off0000c5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB7 17380 bytes
SHA-256: 4c23d69cc994474629ddb6a18547cb2af037d0b380836923c7b96c6b9bff425b
font_02_sfnt_off0001087c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087C 11692 bytes
SHA-256: 0b0aff40fbbdfefbeea26751bf59d97b8759bdb5490175c57ca9abc5d488d296