Malicious PDF — malware analysis report

Static analysis result for SHA-256 648d1b857eb47498…

MALICIOUS

PDF

82.9 KB Created: 2021-09-03 10:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3a51d877a9dd32d7d30855e345365b43 SHA-1: 7ad17ac214d9e5217dc1b49a1583653124ffc32a SHA-256: 648d1b857eb474988fc98e5bb304581d3b90cadcf93a9ec75858c7a2fb8d96c4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDFs hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest a malicious intent, likely phishing or malware delivery. The presence of multiple compromised CMS upload links further supports the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://micast.de/wp-content/plugins/super-forms/uploads/php/files/k296cldietv2obtj76qsihq9re/wobobir.pdf In PDF document text
    • https://tlproduct.com/userfiles/file/dalopevulovodopi.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160db81379d93f---sumupuxaw.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160815d40b3338---20693195082.pdfIn PDF document text
    • https://reniuved.it/file/16680460521.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/77258779878.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce795082a5---68098773574.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/82337136971.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859886a55de---44873888717.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/3214643598.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/kokowiwawoburinerigelab.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/8118792152.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/jibomutenipodujivumufupe.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/tutomilusisipelidubalivep.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c91ac86c9---79635251215.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/nojosuk.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/70269448257.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/jupaxikupenifadul.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/peloxal.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b754e94a3ea---41529515867.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84fbdc3f2a---gebudisugusidudimelezepog.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/36122630847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=fields+of+psychology+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_off0000e1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A9 10524 bytes
SHA-256: f1d602237a06329efac6a1380c43f3ca81d6b8f8a240653f53691a5c8c4a8509
font_01_sfnt_off0000f97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 17160 bytes
SHA-256: 6cb418287c342ae54fbf147c36f456ddd90702cad64f64b3626e4f5e9206c05a
font_02_sfnt_off000125cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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