Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1d9af5e411dac9…

MALICIOUS

PDF

80.3 KB Created: 2021-09-08 04:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6b446f61b21d2456d9526849130dd53d SHA-1: 0e550dbfd8746be433cda4959acef7bb1026c6ee SHA-256: 1b1d9af5e411dac94de044815961d8fcaccd1969e08bbe87edf1c19f26b94243
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further payload delivery. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://msnladyboy.com/ckfinder/userfiles/files/zopoxaxe.pdf In PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7f73bf7c05c765b6ed5611c85b46e21e/mowoxobemixikoxob.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/97588653813.pdfIn PDF document text
    • https://mfdesign.hu/files/file/20128150491.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/u3c4ci8jfok4h3hchicutko0g0/zezizomuwupa.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/sefebo.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f37270d38d4---42739546855.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/779eae4919ec7169cb72ee621306ada2/13428992410.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c15e495d23---77126317038.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///73215965498.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/oaqtnnv4lkpviucfkt4hba8r96/57014900912.pdfIn PDF document text
    • https://peterdegendt.be/file/60594116910.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764d5c6ebdc---xilafi.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/vitiwogusisikowezilalex.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/zitis.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/58bb8f8255c328939a85faa8f6dc0174/78322205821.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/a789a3b473c003ce80d628387980d7c7/53579347720.pdfIn PDF document text
    • http://drironcat.com/images/file/76330179382.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/39682059906.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210814183803_mxyapg.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/o5rici4m96t6c5lano8f1i3drs/3946816173.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/ad10bfc96d24a3feea1b71e67eaa0a32/rovibopapetajulo.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/58174808140.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/nekuf.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/mpfvt4vddivkacplj37fha2lhv/rirowolirowarutafetisolax.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081888503b97---diloxefoj.pdfIn PDF document text
    • http://sushibelovo.ru/files/rubokovixotep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=patience+guitar+tab+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_off0000d58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58F 17628 bytes
SHA-256: d2ff5b0f07188d9f694b020aefbb2446d8aa2b729b884d3226936a46f92f0426
font_01_sfnt_off00010382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10382 10704 bytes
SHA-256: 7c9abf73a3d3cda9df052add01bd666bae0d19ef5bfc65503dabbb25abdf0999
font_02_sfnt_off00011bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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