Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ac70c122b3d758…

MALICIOUS

PDF

75.4 KB Created: 2021-09-20 02:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a10ef2225677bb6579eb6fe771277673 SHA-1: 7a373315b243c9e14b1fb258c4e25ac2218b3137 SHA-256: b2ac70c122b3d758d17ec0ef039aef7af95c26f0b7d01bd6a1cace85dde50505
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads and disposable domains. The embedded URLs, such as http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614380755f4e4---16327711657.pdf, are likely part of a campaign to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://olgapolyakova.de/files/files/niwatepefitopip.pdf In PDF document text
    • http://joyandwowbook.com/upload/file/begevilerakiwovaz.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///48642024223.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/12414466644.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/55398460327.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/funeromovonoxoxafive.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/wuxedufevubikudotafonoge.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/29849978482.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/90745623005.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/guganonewusuladuzoke.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/mewuxowu.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/11381956274.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/25991160055.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/32276433080.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/xudovitoluzirobogomosube.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/38103890160.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/72511360622.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/zapawogusijigubamevizesaj.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/28143269740.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614380755f4e4---16327711657.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/xodaboposotimafanokukop.pdfIn PDF document text
    • http://creationart.hu/files/file/sixosibukesemofuwibi.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147a600df720---xerotofukan.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/51a9a224a6c198b6a76e0fabb129b0b4/dopewam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=contemporary+abstract+algebra+8th+edition+solutions+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_off0000c0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B4 11660 bytes
SHA-256: 457008a8e412cdb9e543b083b6d18bb895e51313f25925e1bad240b26947dd4b
font_01_sfnt_off0000dbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 16880 bytes
SHA-256: 4766436c8c75cf8d548dd20da8bff5e53b32ece13391eea902c4abb141543f9e