Malicious PDF — malware analysis report

Static analysis result for SHA-256 01bd8e07bd6f0dfe…

MALICIOUS

PDF

77.3 KB Created: 2021-09-18 20:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eca8adfe29d0efb26ccfcfe8c60b7daf SHA-1: 3e6fa15548eb9b21d57b446da201aabea0901fbb SHA-256: 01bd8e07bd6f0dfe52605ddafddc9fad0fe3cd8f46d5477a043f9c1ed8a3fd3e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to external sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318f47114f2---23261616762.pdf In PDF document text
    • http://ventmetal.ru/userfiles/files/94900689576.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/davoxilovasumomagunuf.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/96853189228.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/nowuno.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/84872757176.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/zomikinidufedo.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/73270729205.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137655250a1e---gewufopikakelora.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/bokanavegifoto.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/zenetepulakoxib.pdfIn PDF document text
    • https://tebra.si/userfiles/file/mapurim.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/94649059462.pdfIn PDF document text
    • http://selidbe-beograd.info/files/73274005729.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/85953254271.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/lewilupojolatenakabes.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/datalelokowusulowej.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/wurefemizepobaxupagoma.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/56814690415.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/pawevejabevipud.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/18503880335.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/1539649116.pdfIn PDF document text
    • http://selidbe-beograd.info/files/53768055958.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132f1f071c72---53723845477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=apk+zombie+hunter+modPDF 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_off0000c95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16D 17688 bytes
SHA-256: 52262b2561cdf621a4fef7714e6936b623c047b7e0d1ef581ec73c94d090cdce
font_02_sfnt_off00010f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F93 10652 bytes
SHA-256: 1d0b65c2b7108a589610d140cf8b0619c7879e9cdf40198d040aa42513939acf

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