Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1169fd57e846dcb…

MALICIOUS

PDF

87.9 KB Created: 2021-09-18 12:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e670f55864ede010f32f68ff68e13b6f SHA-1: 1ab0093d7ee403c443e72a635b2eec3a329ce69d SHA-256: d1169fd57e846dcbda89667319d7131d3941c58e4475b068d21babf093742f91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the detection as a trojan indicate a high likelihood of malicious intent, possibly involving further payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://fincasotilloviejo.es/files/sotillo/_repo/file/53652186290.pdf In PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/37719867532.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/25393112853.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/wojokugazinedegijel.pdfIn PDF document text
    • https://remini.hu/userfiles/file/jimutir.pdfIn PDF document text
    • http://yuli-china.ru/d/files/gikedupotiduzokagifel.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136410be818e---99534743606.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/zofekubevexuxeguna.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/2524127510.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/37248398441.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/sopilagibepanona.pdfIn PDF document text
    • https://maisonforville.be/documents/file/jejidedixa.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/kiditijafakorutaz.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/xumamuxotejazolufekebel.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6abb50a73---47276211876.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/23955598977.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/salazibudoruves.pdfIn PDF document text
    • http://classtool.info/upload/files/87330485393.pdfIn PDF document text
    • http://belean.pl/userfiles/file/64596790459.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///32015034270.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/kubigakatanaru.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b57afb088059c851284dc2b9d6a866a5/rasunimivakiwonakixazaf.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f27f8c0a80---61591312176.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/36371697620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sony+six+live+tv+streaming+online+freePDF 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_off0000f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001093f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093F 10916 bytes
SHA-256: 635fd7923d1dca02fef93a0665fa601f13877fdb3048e92c1c5e25c25313b869
font_02_sfnt_off00012292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12292 18236 bytes
SHA-256: 5843dfe0b9ddf6eabfb6686d0b931cfda0e3a8f4ceba92694831f217cf91221e