Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd08c0e63c4c9840…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 02:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 80e08bb4a1d66e17e123e7d0d8f38ff8 SHA-1: 87a88d99aebae985b8aa87f4df8fbfb2b4f8c6e5 SHA-256: fd08c0e63c4c98402ee8bec75498d57798b8fd3379ae62b8aae31fb313c61ba8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The primary attack pattern involves a link farm designed to obscure the true destination and potentially deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.pes.edu.mn/ckfinder/userfiles/files/30507728216.pdf In PDF document text
    • https://shioturboapi4-xyz.com/contents/files/padusopegomajimiga.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/o92rlg3590qj4gmhs5110cdsh6/mokusezuwaretujixozolu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f71fe51f52---31182107193.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/26949832545.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/pefegisimemuwozarede.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/7969790924.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/pavoj.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/c268bc31f5c1351db3537422bd78a621/77406927208.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/36246621731.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/41448456299.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/paved.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/38444847576.pdfIn PDF document text
    • http://yongqingtech.com/d/files/36248038080.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144fb60c559d---18283387074.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f85e5350fe---23656375097.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/lulajelojoxeji.pdfIn PDF document text
    • http://birdwatching.sk/media/file/91993446130.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/31486751759.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/39489113813.pdfIn PDF document text
    • https://baglab.pl/galeria/file/fagosuterobagukepunaxemo.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/pomifezereduletokajiban.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/jorupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=new+grinch+movie+streamingPDF 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_off0000d8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 10760 bytes
SHA-256: 70d221f24551d5df797a68954edc63279fde1cb36a24b6c01778f32464d8dc4d
font_02_sfnt_off00010999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10999 17880 bytes
SHA-256: ad41fa2b4662c03a774ddf52f9f0b57809451f195256773d3c14e7a90c5f7eeb

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