Malicious PDF — malware analysis report

Static analysis result for SHA-256 7043a0ad773eb46b…

MALICIOUS

PDF

74.1 KB Created: 2021-09-06 00:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 70f31041805c9a03374aebae1818ade0 SHA-1: 4c6f572b8c3f69669decb925699f76110630fca9 SHA-256: 7043a0ad773eb46b8fc4ec9839aed55abc42604fe85f944598e79ee7933865d8
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the primary indicators are the URL patterns and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nordicaluminium.ru/userfiles/file/76039342958.pdf In PDF document text
    • http://akcjonariusz.com/UserFiles/file/65786122064.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/21114647860.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160731f1c47d1c---jonatilobadumazaj.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/51714253133.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b50fc75f2---bedaruduvu.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079800c9edfe---bibapopimeguwabadedi.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/14655559796.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/zeritabilukajozobuvibide.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/pasumemukedisadojofegotu.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/xapel.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/fewozajajaxidud.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/78813172436.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/76527145094.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/80710027309.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076f957cfea4---55351394402.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/kkithqbq7rlov50rdp4o4dhno3/loguvolafonejapadifevavem.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/69hatti3ctcntvt5sco16dec1g/97830610159.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cc4c82116---wugagegefose.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4dfa75830---21627334259.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/db434f2d319d1e3c303f64d051b120c7/wubavijabusewu.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/memob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=world+map+poster+pdfPDF 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_off0000c0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D8 10456 bytes
SHA-256: c8dd95695d1a2ed623ded68d831cf4e88479733f875c315924a6fe300f130694
font_02_sfnt_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 16396 bytes
SHA-256: 1fef25ee349dc6eef65b67dca57ff6fba7cee087ed05d0801926ea4df43ff7b8

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