Malicious PDF — malware analysis report

Static analysis result for SHA-256 15388d279ed95a4a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 21:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 45bdc1f58cc2785a76b02017978a5c57 SHA-1: bb582ce70ff465df2b717d4bf42e3247d859fc0a SHA-256: 15388d279ed95a4a8de37d28d52416661de60740d2a6c0e24bc5409588e9a739
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the overall structure and URL analysis strongly suggest a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=2016+eyl%C3%BCl+tus+sorular%C4%B1+pdf+antitusif PDF link annotation
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/4jk0lv44htl6ei887s2ui1bif2/viwil.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/69725565280.pdfIn PDF document text
    • http://school15-tyumen.ru/f/fufowawenoserubuno.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/nomodovab.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/02a7168e09543f110a91498ddd9ec26a/1498455431.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abcb53303a5---92338966549.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/47421957655.pdfIn PDF document text
    • https://thechoose.it/file/dugeka.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbc98137807---33355527731.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cd9c2625e---53218317945.pdfIn PDF document text
    • http://konberdbio.com/upload/files/vewugamotoxigiwit.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/mebamafolofoju.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/pigoxan.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/69761644677.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2430d41fd---ximomazumozimixovomigon.pdfIn PDF document text
    • https://etadelloro.it/images/file/42818854925.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/titulenapulomexiwo.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/30138239638.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/porovowefat.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/buzipotapuragip.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/16741114392.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/75f469ecf699ed28806c3c0f9fe55c07/54888771782.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/zajawajexunex.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/16801605900.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_off0000d699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 18396 bytes
SHA-256: 89def9fdd587389d3a41ba7df6b952bfa4bf0528362a7c8bb7389ecd93d9ef9b
font_02_sfnt_off00011c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C56 11308 bytes
SHA-256: 9422b582aa0df4ef49e1b8cc0415df178d6b8276e324b1163ba7c0f40087f8d4

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