Malicious PDF — malware analysis report

Static analysis result for SHA-256 05333988f83b5362…

MALICIOUS

PDF

129.4 KB Created: 2021-09-03 20:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 97ec8848365510bf29275f5315c8af68 SHA-1: c0e8f225fe7aa5170526f48772918715cd25a89f SHA-256: 05333988f83b5362b45f99e8eb2ea89bee97f235731373fc53d36dafbf9d54ed
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to lure users to phishing or malware download pages. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=fujitsu+ducted+air+conditioning+control+panel+manual PDF link annotation
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ef0e4ba65a---nisegelepem.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/498f34483fbb4b86bc492a02b0928fbb/51747160118.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce94852fff---jiwasunipagew.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/l68a9iam8v1sdmuqtu4e65flip/68661938073.pdfIn PDF document text
    • https://codecs.ro/images/file/3245731902.pdfIn PDF document text
    • http://gespk.com/userfiles/file/wijevetaraniramufeziteg.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160703fd42ba38---61741424884.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/lawalijagogizusugos.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/qj93tnch09ddoftu0uog0dkodc/95865325762.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607313c4a25ab---32038824566.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/24075472852.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/4951384258.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/gopatanugisamob.pdfIn PDF document text
    • https://parc-hotel.info/file/94178270678.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/sajeguvisidimutovino.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/fanef.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/bidob.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/nonoleruxokapirileritaret.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161116c619a595---guvif.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/gurupedepov.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/24191586596.pdfIn PDF document text
    • https://rivnerun.club/images/files/89755650923.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00f5ed18c5---palajibiwufamowekur.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_off00019600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19600 11064 bytes
SHA-256: 94919753e557e1cf27192dfb8cc12f3c9dd234eb3f776d9e68623ceb49ef2a8e
font_01_sfnt_off0001af7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C78D 18588 bytes
SHA-256: fc9beb2681163bf45ad7c0c545ac3e8d34f9e89455e35658b3f467fd1c8cbc7b

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