Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5075d979353bfc1…

MALICIOUS

PDF

90.1 KB Created: 2021-08-01 12:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 962a55ab43ca8684ef05105baf959682 SHA-1: 621abcbad00b9e7be417e51a28da0293db71ef37 SHA-256: f5075d979353bfc1810a848f5bad3d2a1e05f5230bcdf50d99a4e5f38e7d61c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as download locations for further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4f3833a1f---63462998617.pdf In PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/161a3c53f03d2da20d17c28e2cb371f4/58071094236.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b7d91df69---kafisi.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a217c468a03---riwavefoxefoju.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/f2bab24667ee9875c6b19ea455ad11cd/25854974570.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/sokefitunedirok.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/fedakuxit.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/hfqplc0i4avvok3q9scnq7gss5/92525800161.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/dologitevudaduja.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/0cqojcj2mqbm5v4poht6mitng0/xedin.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/kajemilejebo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f175ed1d899c911ffa3c939af94784bf/zelomudojaza.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/wetituvibupugabozigevax.pdfIn PDF document text
    • http://goref.ru/files/file/geradobugujasu.pdfIn PDF document text
    • http://rld-carbon.ru/file/17850267797.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/kuwexubakaw.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/bcd4c35784caee0be56f421f044fd847/xogafatutavonu.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/furatiwavegulikesev.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc19dd1f11---ribira.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/83595393537.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/38532551689.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/zuluripujozovelobur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+read+speech+audiometry+results+srtPDF 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_off0000fab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C9 10964 bytes
SHA-256: 74f64dac2d5d96df15d478fe1621973b78ce1ba8e67bbd1465dc8a0cc29c12ed
font_02_sfnt_off00012c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C47 17356 bytes
SHA-256: f6fadbcd9afc6717e49cbfc220dec9a875d59fc9cd0b8b3ab0b038966e2b846f

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