Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e882d6413508799…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 16:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 016b422b3a37c316a2669663c0135642 SHA-1: 71fa00901a6bb94d7dd775be4d98564784deb6d5 SHA-256: 9e882d6413508799d9f7753145bf70deaadd1fda4d0e3ae4697dc156fbd5bac3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://oniceh.ru/uplcv?utm_term=apk+ipa+spider+man PDF link annotation
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d09a53e060---fazaxubuvoranexuxavaxa.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/32763238211.pdfIn PDF document text
    • http://www.siposferenc.hu/html/37625345188.pdfIn PDF document text
    • https://pisausakti.com/contents/files/76381533408.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210910_7F48A9D10FBFFDBD.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/kividozidinisi.pdfIn PDF document text
    • http://casauthienan.com/fckeditor/editor/filemanager/connectors/php/temp/file/xokujiniwabanugif.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/8724749158.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/32118485893.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/55237493523.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/dasejotogixerajane.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/wewajaboten.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/18677859617.pdfIn PDF document text
    • https://kar360.com/resimler/files/70633102435.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/fafibafixovesabumatevogox.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631852787_d2fcc21f84.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/zosanasirego.pdfIn PDF document text
    • http://findacommodity.com/upload/file/53382688727.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/80434001514.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/97904524463.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/57032181311.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161431d8c40967---76861569888.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/pcuupsae7e9jnlq9pghk1e9cf2/36193312436.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/62003083595.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/kerobonoredazube.pdfIn PDF document text
    • 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_off0000da60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA60 17744 bytes
SHA-256: 889f90e329423c340b721e41378dccb1bfc4aff598d7d8153cd748cf8f258452
font_01_sfnt_off000107c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDB 10360 bytes
SHA-256: f0b3c3c94a58742a0b66280ae5be02f1906c18855b847339cf5e3677ed9595b6

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