Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0da337ce09d1a5…

MALICIOUS

PDF

72.5 KB Created: 2021-09-02 17:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec0e36d664d53cf37026fa079f8514f1 SHA-1: 5f4776a60628a480c36b274b8c818c62a0008aa1 SHA-256: bc0da337ce09d1a51fca302748ccacfa4ae45f9aaa9724928041a041d31d886c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to external websites, including those hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The presence of a link farm on disposable hosting further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://mediedil.eu/userfiles/files/jepepatira.pdf
    • http://bmcnx.com/userfiles/file/tawidavapex.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/124be339eace689bf9ca0e9430fd904a/52004966127.pdf
    • http://tofuyatogo.com/uploads/files/56853353510.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e2eb4c340---luzamafukopisekemuwubelem.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/086225e391f116fa84c6d2a47e736473/vijaloxejuxipaz.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070cff776bba---29560460016.pdf
    • http://harlit.com/upfiles/file/dukimeparaxi.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/7249c6efcfaf4063940045a91e389046/42038343078.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30b10b2779---75520130345.pdf
    • http://debandhelder.nl/ckfinder/userfiles/files/35476908062.pdf
    • http://mastera-mix.ru/ckfinder/userfiles/files/29779415030.pdf
    • http://www.mediagrand.hu//data/editorfile/fozojisumutekowawu.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083b11382173---2678345575.pdf
    • https://hotellemaritime.com/hotel/upload/files/firut.pdf
    • http://gerd-pollak.de/userfiles/file/12837856712.pdf
    • http://edu-family72.ru/content/images/uploads/file/97172753232.pdf
    • http://vrakskodamnetice.cz/file/dubefukatid.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161291c3587b9c---bupatakiwixixasagoporerib.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b36c3641f---laxibozinututiwikete.pdf
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/37971410612.pdf
    • http://wwstationery.com/files/file/17884846681.pdf
    • http://lavalnerina.it/userfiles/file/bifevalusegolaz.pdf
    • http://lmtechsolution.com/userfiles/gafarumusovir.pdf
    • https://sasalidayanisma.org/uploads/file/33285905940.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9784cbd6c3---27715231591.pdf
    • http://guides2alpes.fr/uploads/file/suxazibobodo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ctek+battery+charger+mxs+3.8+manual
    • 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_off0000ba75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA75 16792 bytes
font_01_sfnt_off0000d287.bin
2a42eb925856332f816e764105d518a5d0081e53606662975e5186b317a41dec
pdf-font-stream PDF embedded font (sfnt) at offset 0xD287 15320 bytes
font_02_sfnt_off0000f957.bin
1e1df0b94cc55cf8eac9a00d1bf41fd961ddd74b6a8caa6188131fdf928c534d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF957 11492 bytes