Malicious PDF — malware analysis report

Static analysis result for SHA-256 987831bccaa4f89e…

MALICIOUS

PDF

78.9 KB Created: 2021-08-12 16:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 78406b13388a9e9ee46feb7866eda81a SHA-1: 1d0b60a45bc5dfac76a0a3ce6c3e1cbd9c4d6653 SHA-256: 987831bccaa4f89e2892b61f4d4c9f04b9d6db28f60a89f31bdd25cdcaac4789
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics indicate the PDF acts as a link farm, directing users to various external websites, some hosted on compromised WordPress installations. The presence of embedded URLs suggests an attempt to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://crewmak.ru/uplcv?utm_term=how+to+reduce+pdf+file+size+less+than+100kb PDF link annotation
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210719060212.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160de4f7beec5b---paboxedit.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/92225112916.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/rolebinukina.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/7831425626.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/93938279742.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/73703b9aa003940f44e797ed0e76aa16/98970129563.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d7a65c378---setofoxejogabexeburililib.pdfIn PDF document text
    • http://debten.net/UserFiles/File/73933998334.pdfIn PDF document text
    • https://abeess.com/userfiles/file/xosujukageki.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/kuzorageseriruxijo.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/zitonif.pdfIn PDF document text
    • http://www.ntweac.edu.hk/admin/ckfinder/userfiles/files/digukutise.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a235a863e8c---31105937850.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b693cef09e89244d196e0eaf94c59b30/zuzawukojosobigovasovado.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/68022621736.pdfIn PDF document text
    • http://www.polni.si/Images/files/63264900609.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/supodebegejokasazusilu.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/8c7ce69e3e63796050650dc0e70260ef/50310246466.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826da75e4e8---wivozetozisirig.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160780c02cf5ae---18533401149.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bce30d939---bonefuremitug.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/16365186665.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_off0000cece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECE 11360 bytes
SHA-256: 485b180d5082f8148c7abb1bb9f1e1ff6fb4b0f9b158a798f86c6ea94375929c
font_01_sfnt_off0000e956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10168 17212 bytes
SHA-256: ede14149c9de5e6f03f00ee6bb2c4a4a9fe290db40314831ce28e5e577399ef9

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