Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c1ba11acaa0eb6…

MALICIOUS

PDF

121.8 KB Created: 2021-07-16 03:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b9e6797d9165f5388b2ac395061ece3 SHA-1: 305fddf0e40a07ce28d24ca3f016f35d81dd19df SHA-256: 06c1ba11acaa0eb6ad3fc56160aa409fbda8acb77b394a3a9479768345c9f754
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://gndpta.eu/news_objects/files/15491438637.pdf
    • https://contabil-fiscal.ro/mm/file/64003745130.pdf
    • http://abogadosaguilar.com/ckfinder/userfiles/files/xoweminururanarineviniwip.pdf
    • https://travelworld.ro/userfiles/file/jolimovexogotajejusiwege.pdf
    • http://com123.vn/uploads/file/fojuzoduluzifadigedipazo.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/3ad74471f58fe1a130bdcff4761ef34b/rozagezuvo.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/r86et3hg6ph423i6lddmer8jfm/47215643298.pdf
    • http://artpolinakuzina.ru/pict/file/36593087573.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b06d6608408---woxofojogezabuwomutenud.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a0e485f6b5f6314238f9cc4183ae2002/koledarenagivi.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/19d1bf2eff017332d6512921a0ab5c74/54078889666.pdf
    • https://divinenine.net/userfiles/file/kawikuxefibijesubudox.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/247m6dik6co743i09jatuevqp7/92341753130.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/117551cb1881ff47ac1b033728b3c354/roxagixoforunafotij.pdf
    • http://zabradli-znerezu.cz/userfiles/file/58857959956.pdf
    • https://cowichanmusicfestival.com/userfiles/file/77528508503.pdf
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/sotoxurimes.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1ce321bbac3415060c060513c02242ff/xivuzozifuzaxugugij.pdf
    • http://alnadaoil.com/userfiles/file/dolokegewodilu.pdf
    • https://marljivo.hr/userfiles/file/jaxofogol.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a26e56104---dodixovuwiruwiwimuvo.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075bebf07e39---63782942045.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/mki5irmhq5vh6e8em3dbnbnrn6/bivokuvaloviwusirozexega.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=csat+2019+question+paper+with+solution
    • 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_off000174aa.bin
4af3faf6a46532b6b21de8971e6210040eebdd309ed683cb20b1ea80287fb6e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x174AA 18572 bytes
font_01_sfnt_off0001a620.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A620 16792 bytes
font_02_sfnt_off0001be37.bin
6d3473b4243d8a22c6c955c22d20d4bc9f92e3867eef3ea438e8cc10872f296b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE37 11172 bytes