Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e7926fabc9a069e…

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 01:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2d3f5467b8267fc0c392b843fa950716 SHA-1: 42fc408a8cfb4fae51b7b0de051b64682e389326 SHA-256: 0e7926fabc9a069ee404c737f2b8be1178fc2c0604539a9c8504bc36ebe3f629
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://queure.ru/uplcv?utm_term=intersection+and+union+of+sets+using+u+worksheet+1 PDF link annotation
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607453158dd9a---50810270673.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kifigewoxugomatevaleba.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/vekige.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7e3b288a6---83184271130.pdfIn PDF document text
    • http://i-physiology.ru/upload/9362125380.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/resefeg.pdfIn PDF document text
    • http://xsteelstock.com/d/files/tugosixegelozugonurev.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/pubatopoderopudoximoxujud.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-29/20210429135140162097.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5ac447e5cd0af1707e5355409822afa4/newajipinuba.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/98696480796.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/31705404339.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/vbg8rg48037co1ckonr4mo50p7/59148412464.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0b42755ad---pokalozonivov.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/pobonalurisunuvorumiras.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0s37aot2r3jrstgjpb1nltilp5/44365376671.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/mejiwavepuvixul.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/96f33c86bcb937831749d9295f9c0ddf/fawanoduzeniwoxoboko.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/47241638531.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/jipujojod.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/suzoba.pdfIn PDF document text
    • http://darec.sk/files/files/55351753960.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbff639663---nevesitobalupexuwuf.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a93e76b76---69228485883.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/9131282923.pdfIn PDF document text
    • 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_off0000e803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE803 10992 bytes
SHA-256: 163346b79636e9af85c9c566f041ae2877b9c3488cbee277f400f1df42d844cf
font_01_sfnt_off0001016e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016E 18280 bytes
SHA-256: ae1c292514b23c60883bd6b7f7936170756694ed64c1cf5758901a6b4ea9c863
font_02_sfnt_off000130e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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