Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a9141d9b0a10cf…

MALICIOUS

PDF

120.4 KB Created: 2021-06-09 17:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a8308caf5232ae6ba108cd06df8898c7 SHA-1: f7f4a610db93d850a225f791501a0593a6cf3a98 SHA-256: e5a9141d9b0a10cf4090b2f316cc7d78d372c30d252e7a412573ba73a6741c31
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into phishing or malware downloads. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8986

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://crysiq.ru/uplcv?utm_term=challenges+faced+in+teaching+religious+and+moral+education+in+primary+schools+pdf PDF link annotation
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/28608214408.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba76a32ebe---wowipadu.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/252b507f7bbfba08a0ba7cbe98d464e5/61265667675.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ou4p4ojar71g5e826fud6u23r2/76212884226.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/zavejusomub.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/dbd377eefb35b48704ee3646c1e9a4b3/mabedawoxozezumupa.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b03bb2034257aa0db821a1bc1ad8fe85/xiruzu.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f450705d7406d909770ee032e942ae3/43628262200.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/50167975408.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/9erdbef4vsk4rlku3t8uqh8l8s/dimoguti.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/3440a504b8309ed3608fb0c292b7cfe5/1617552876.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/bfn12tku845s106upg7u1tef8e/38252458879.pdfIn PDF document text
    • https://artbynela.com/uploads/file/lulizufu.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/qv86u1slcl9dei5s026rf9c2s3/bunazimuzajudusi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000160b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160B3 9136 bytes
SHA-256: bc154503d20dda46c880c44ff812011621e36248ca1597e23ef31f23101e1b34
font_01_sfnt_off00017f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F4C 5576 bytes
SHA-256: 0121aeca459f3b6d058a90aec130872bf6bb95fa88f87cf4e4e10e02228e6f02
font_02_sfnt_off0001921e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1921E 15656 bytes
SHA-256: b7784a02fe72d4760bbd581439d1a9402f9fd02505d40b4a13480560acfaea85
font_03_sfnt_off0001c352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C352 20072 bytes
SHA-256: c51dae3cfbe1ec4e1dda1de5e3372b3f2083715c06c5425ee307f5ecd380de53

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