Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d18f2240479831…

MALICIOUS

PDF

73.1 KB Created: 2021-09-26 13:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 50a6dca9b73935f1a54147c2d0ce9c52 SHA-1: c2b06ada6f2007467608a9b04868079550be4f94 SHA-256: d2d18f2240479831921fe04a98b20678b5a873aeb4bfeda4fe597d9a34845e31
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and link farm structure are designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/9485025426.pdf In PDF document text
    • https://baigiangtoanhoc.com/upload/files/88599667545.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/86575962211.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/kobodigudaxasubufekofo.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/majufamujupibijive.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/l4etppidstguems7567i2h5dsi/67163660512.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/69866c2532bedb7886e88ac11a1f28b3/5603659748.pdfIn PDF document text
    • https://marosme.ro/hirek/file/winijiwoworawufaf.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/26233238811.pdfIn PDF document text
    • http://csc-027.com/userfiles/file/20210921182502_gbo5d9.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/n84re3qut3evsjbuatrju1i3v6/zoranomalarajedal.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/74874838590.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/77066032328.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/c9ca0a260586b2d874c6317fc23ecc5b/28290186573.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/tegon.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/peroninovuwabijuruvadis.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/69833408102.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/rovugipirowawizabad.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/tazimaxul.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/72114333726.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/roduralekarep.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/polajuranokaru.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/gedonafagizuri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=como+pasar+internet+de+android+a+pcPDF 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_off0000b906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB906 10660 bytes
SHA-256: 1b332c2bd0b56d0c04fc2da50d7535c33934cbc61f4ddc9aa16a4be93001b218
font_01_sfnt_off0000d16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16C 17824 bytes
SHA-256: 4c22a8c53c35eec7dd553c57300ab7393df61ae17f2fdaec731ce9e65768d17d
font_02_sfnt_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1