Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca38ba220c0f31e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 15:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 88c300bf68af2e3cb828000a6f7cc950 SHA-1: d9ad548aee517e984f9b7152c2145803e2211777 SHA-256: aca38ba220c0f31e120f5a1755439b04d58dead93947d5d6be062b9c23460ac4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://familienarbeit3plus.ch/userfiles/files/bajuvotuvafawobipisipe.pdf In PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ea71kfapvv7a4akha4eda61594/25139512157.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/bibapilepoja.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/57691681865.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/54988863130.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c917e3b173f---lavuli.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/55336008791.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cab16d6f3b---10594768185.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cedadc86d---39690102651.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074c25a64fff---rubibotikabofujefewopoxe.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16084d5834a1b6---77927211634.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/zanur.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16073ab7d02acf---21391803479.pdfIn PDF document text
    • https://network-italia.it/file/86424196159.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/5d71576e3c9ebb1b6bb9b1e3dcf4e715/90197312955.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/79513626790.pdfIn PDF document text
    • http://lhs1965.com/clients/880801/File/lexavenaxoxudabevumutuk.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/2008057738.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021527654415615.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160756eb3c7456---27359331064.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d74e3db86ba---komorikarijunipibiruwoxip.pdfIn PDF document text
    • https://angkalaris.com/contents/files/tatix.pdfIn PDF document text
    • http://healthywithhart.com/res/file/35405281369.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/vowevulutawajej.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/jezirebikogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=differentiate+between+renewable+and+nonrenewable+natural+resourcesPDF 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_off0000dad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD3 17212 bytes
SHA-256: 12f0d5664ab4e89260feae6a1ad0eb7b88aceacc3688cbab28b98c1b10fda3db
font_01_sfnt_off00010765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7C 10796 bytes
SHA-256: ffb2c5fe015d8867491efa9010fd4a7234a7712b381a6cadb6eed7f223cb7410

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