Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f30af9a8e5429c1…

MALICIOUS

PDF

81.6 KB Created: 2021-09-02 00:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ea334b64a12eb5c480f4c8a5a4ac2043 SHA-1: 30414caf9ae0d6bddeb91ddd9bc24371725aa933 SHA-256: 5f30af9a8e5429c1f427a806ceed618b5278f5536d71b2bc5b3830f5c5a7f840
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous compromised WordPress sites and disposable hosting domains, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/dc9aaa65d55c5cb00b82a238e02c8767/paluradiluvamifoxuda.pdf In PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16104792c87733---3132733038.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/wonogitoluxibik.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/sedarupinusuj.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/0cc078fa1055784e16fde71179934c35/vazuxowewafupawemem.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/37615548242.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/78632067963.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/39642356692.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/96733638927.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/79784472639.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fbdf20d204---40117254675.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612d72b1a7887---49232037466.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/39907251450.pdfIn PDF document text
    • http://irollee.com/userfiles/file/85443518095.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1610b3b5169593---23888869421.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/60950526491.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/97346387253.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b38698be92c---25542545889.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607215fea63bf---moluzunusixekaje.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/47597867211.pdfIn PDF document text
    • http://reflita.lt/uploads/files/gonatekowu.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/52232707183.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4af53d3a4d---52210320112.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/16248661951968367782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=variance+and+covariance+of+random+variablesPDF 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_off0000da9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B5 10712 bytes
SHA-256: fa8bdfe9538a7923443e932e0741a004f5bb259eedc4b91c720ea56bb6a7dee8
font_02_sfnt_off00010b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 17508 bytes
SHA-256: aa35c095403cbbc606d6fec8c8a66fe9d041942660548842d9797a7a54c00ca3

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