Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32b6c234d61f3d1…

MALICIOUS

PDF

98.9 KB Created: 2021-08-19 00:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d54e63c5c7797ca11873c78d38206d83 SHA-1: b262a5c3900bff6b513b30829f9c111bdc14982f SHA-256: a32b6c234d61f3d14f1949fa3843ac0e748bf54f0f0d2069c25453369369e053
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS uploads or appear to be disposable. The embedded URLs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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.hydro-tg.pro/upload/file/25940101069.pdf In PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/2bc7901155e9905663d908378ef2ca7c/12516913461.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/39343774337.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/90936867454.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/rupinutebot.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/43389613774.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd8b109dab---wakabinugedodafisageb.pdfIn PDF document text
    • http://riversedgefm.com/files/file/fomakimi.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9a71474ec---97399253509.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/779cbc59843fef62baf09768a5d18153/butojixoge.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/29176430102.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/14478257333.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/91fbb8ce2b49c102f2b7cf918b8bd7db/14117471782.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/pazuwavunoretadavewipav.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160833e51989a4---karumanobumagibagetuxuxa.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/77403288183.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608106da89d16---rotovaza.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/34318795496.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070abc4df2ec---bakivenu.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984c61b2630---vunoperedixipe.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/k38cjl60eqef41u5tcmrsbnvj6/gexiruwosifezomip.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/bodowumibigotedasa.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9e9f126ba---57032323065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+figure+out+simple+and+compound+interestPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CED 1668 bytes
SHA-256: 0a4af374cb035e676210909e4790276a619635896d879aefac6ffd5912e9aefa
font_02_sfnt_off000134e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E2 11140 bytes
SHA-256: 9386e9175b2ce4eb6351f58aaba21b25b7ba5509b958fcfc80ec59552355d95e
font_03_sfnt_off00014eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EB3 17884 bytes
SHA-256: 18f407b14fa1e344c0b7ac5c0247c7619a4d2ed661da570d3a627ca2a11f6738

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