Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9700a33555dfd7…

MALICIOUS

PDF

77.5 KB Created: 2021-09-01 16:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: bcb2500b701a11f4acf6efb238ff7973 SHA-1: 906b17a92de1c4b143a97c955cbc8005412f0cba SHA-256: 5d9700a33555dfd7c69c88630426cd67b480f85f8143a4fad79e43e14ee2a985
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mangonebike.com/uploads/file/82893820288.pdf In PDF document text
    • http://sinproval.it/userfiles/files/nakusez.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a43051145---rujakomudegitatulisewe.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/15434193823.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/20528826046.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/115a93ee2ba57fe17609181322599c3c/rofixute.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d764a753a1---jamowapajeg.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021070301091073499.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jutozidedajen.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210724_3FB94AD73A0DBCA2.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/43768382248.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/finalifobejujerazedomag.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/0aec42447f67fc515a601c3447caadbf/jukego.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1599784149610645187d925.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/faxebil.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/68268656812.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/jagakogawopenegiwitifab.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608011d37f4bd---xunisa.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/869feeea1f60f68c251e1161c664b158/54562299757.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b98ce66fcfd---26666345461.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/b000b12c97fdfef547c64e96c9ee63b2/37330645012.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161216f98a23de---xutejuxokepegofodux.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/37f6e054n91nb6h20kk3lccon3/gixatabifi.pdfIn PDF document text
    • http://goneviaggi.com/themes/userfiles//files/95754307263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=town+of+paoniaPDF 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_off0000c920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC920 9856 bytes
SHA-256: 9a2eb34e206610203f8d089babed8edbcf4961bb0fba3b6bd414b0f0d660dcbc
font_01_sfnt_off0000def4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 18644 bytes
SHA-256: ace870397c88a4966c122c81bd7188e5732abba93ebb553290f701e6c2fa18aa
font_02_sfnt_off00010f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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