Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbbf889a8012f281…

MALICIOUS

PDF

78.6 KB Created: 2021-10-04 13:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9f724fab9ed257e64d16eb875fac2cce SHA-1: 50a9651879baa2df4164fb6ed50b751a5fbbf1b1 SHA-256: bbbf889a8012f28133044b49a1dc0abf4a57bcde2c16575e69fc7698fd53f2bc
216 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs that point to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document text may contain commands or exploit references, potentially leading to client-side execution. The primary function appears to be redirecting users to malicious content or further stages of infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://huntic.ru/uplcv?utm_term=vector+mechanics+for+engineers+dynamics+9th+edition+solution+manual PDF link annotation
    • https://dermatologie-chamonix.com/userfiles/file/14705275561.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/36118437072.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b33530cab8---72422163541.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/qm51ogfnh9l00rkdjqmsbcg6pk/19677423627.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135acf3271bd---jibusuvugewatofoxe.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/40303963884.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/in6iitnvd6mqh1h91d6vi9ubv3/24963043048.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/e34eaa7b71d726eaa642a5cdcb7d6981/bixirebetewoxagiz.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/73747489774.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16153e26063a22---1747570889.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/jirixasozip.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/motiwetutudilup.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615185df0b761---nokodobijiseruz.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/91218155420.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/fabutokifojowixukeza.pdfPDF link annotation
    • https://bearings.vn/images/ckeditor/files/bijigazeme.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/tipopenobog.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/zezopidagifodamapide.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/11171005065.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/pepexugazajagumekojare.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/98392855438.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/3svtfqspbec2bhkq4e18ttcmdo/11213711863.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/59040393026.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/fiborutegisamijolubebo.pdfIn macro / runtime command snippet
    • http://dakhoanhanai.com/images/files/52746078796.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/fileIn macro / runtime command snippet
    • 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_off0000c97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE194 11272 bytes
SHA-256: 2bf5f16d12f6dcd8f42444e01fd02fc4fcd71fae273231cb7c1d562b0b3f3575
font_02_sfnt_off0000fbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB7 18740 bytes
SHA-256: 6fd919f9c54108f2e3f9ecb440c1b22eab54d0eb265d3de34efabbbcf80c3b80

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