Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54e5a0b70c49a75…

MALICIOUS

PDF

75.1 KB Created: 2021-09-30 10:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4ba1c76af6cccba0f620b921c19590f SHA-1: 51c6c2166562d37b8e6aaec8c9c9b1a8c0f8539c SHA-256: b54e5a0b70c49a75743f0db63af857ebaecc380e7f1420580f13538ee979012d
176 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate a malformed exploit stream and that the PDF acts as a link farm on disposable hosting, pointing to multiple unknown URLs. The presence of external URIs and the link farm structure suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.asap-recruitment.net/upload/file/muzorotitivefe.pdf In PDF document text
    • http://a-xian-coat.com/uploads/files/202109220323242483.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/53683247130.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/zixuxewipetoso.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/6519107523.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/libegidoguripu.pdfIn PDF document text
    • http://zae.me/datafiles/file/javibalegetaxugunodepibag.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/bekijoreleja.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/resafoxasefileked.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/94637125213.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/6594107977.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/gefez.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/75211070426.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/levenupewaxa.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613369f71faf1---tejokekividasijoduw.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/61338007411.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/40752084457.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131f41d8cb11---xulakugan.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/tafamona.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/44224526569.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613faa3422cc1---gojudogikoso.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/85306418220.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210925035627.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/68390350922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=need+for+speed+payback+on+androidPDF 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_off0000bbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEB 19284 bytes
SHA-256: 9d7e870a676b1584574f07f7d903e56f78304f734b01420a2193a0347a7ce5e2
font_01_sfnt_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001061e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061E 10792 bytes
SHA-256: 6103a75460db068abe7d61985444166f1b412fe3db605d3f3481cd9e177ce39a

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