Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a38e9ee91ab2254…

MALICIOUS

PDF

80.1 KB Created: 2021-09-24 07:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0fb2c9d241b21e0ceca9a00a24436654 SHA-1: dcf6138f6be14a9e0e6760dbd21d89be30193099 SHA-256: 7a38e9ee91ab2254c289536fef3e49bd84462fe466eef244a3cab9fb3d87dc06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content or download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://infrive.ru/uplcv?utm_term=download+game+moto+gp+untuk+android PDF link annotation
    • http://struttur-arch.it/userfiles/files/nudexifekadujoxijulurew.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/tuziwivorelul.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/63072063056.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/fezelijuroxetebewizob.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf0b35b3e0---wipuzitizorilelogulogal.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144a5db6c378---bafolu.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/27327536185.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/90100024575.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/tavoxaside.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/zajawikebuzala.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/duxasunisalir.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/28066297712.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/lixewi.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/20/jepunilaxavufe.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/tomagisopusafevi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/25b84fb965788555ebf70b37f999b7f8/zabato.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/5840091060.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/50136906654.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/ccb48075177eeae44b4f020c47232d92/durabijudur.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/95833465955.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/jisumakupifukufano.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d03a18039e---viwemitosasorarinapopus.pdfIn PDF document text
    • http://checopharma.com/upload/files/bilonilotebosixefojal.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/e048b7a28b025ba892bfbdccfd97c03c/tadali.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210912_134524_125.pdfIn PDF document text
    • 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_off0000d725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD725 16704 bytes
SHA-256: c248b6144f08b15ea71271fb49edb926dae63f355ba84531b6c9a7b763d92ecc
font_01_sfnt_off000101f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F2 10848 bytes
SHA-256: 45799b38b7e068ed192cbaa4fd453254456f06d352244ec0508621d945f1c660
font_02_sfnt_off00011ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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