Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e7efca1b9d3593d…

MALICIOUS

PDF

66.5 KB Created: 2021-09-07 06:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 829edbdbc11633d041530516d85f6ead SHA-1: c4bd9326c64e7568c756283636fe74ee45fb1986 SHA-256: 9e7efca1b9d3593dbfb6586fe9c1696fa63b731b003d9bdf2e5a40e05757de2d
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_URI and EMBEDDED_URL heuristics further supports the attack pattern of luring users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9524

Heuristics 5

  • 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
  • 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://allytemp.ru/uplcv?utm_term=kitab+sirr+al-asrar+wa+mazhar+al-anwar+english+pdf PDF link annotation
    • https://confidence-ist.com/ckfinder/userfiles/files/luwavatuwepufes.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff77f03664---99871620907.pdfIn PDF document text
    • https://uangraja.com/contents//files/97736659916.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a494c153d6c0b772c7eb37486ebc3c0b/vavowirazalogapifido.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/1293773116.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/74247136982.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/49a27fc726f5fa1eda25cb039a88f785/jademagiv.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/8cd0f88e3f97def68a469630502e06a3/muwetutavexobunaderitari.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/kusasazinalutexa.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/putelob.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/2617654561.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/50655510262.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/99281016634.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/556828e19348e5025e3f783de818be0e/82558095468.pdfIn PDF document text
    • https://susta.vn/userfiles/file/fezodosilifakegex.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/69942574860.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/29789764693.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/43641134890.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/votawiwujategi.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96436e07b---63052932225.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/67c19a128bbb01bf724fb221cb1f2d20/912372128.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5329f87f47---51123848804.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF8 11136 bytes
SHA-256: 75178c394723f2b92cd39d8f5d8ccf64ace7556ff37e499e0378fb549841e0bd

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