Malicious PDF — malware analysis report

Static analysis result for SHA-256 651b03da95690b77…

MALICIOUS

PDF

88.2 KB Created: 2021-09-18 07:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9dac9e919168d68d53130da2d14a9f2d SHA-1: 6cf1f77bcd8fd9d554f5a9cc2fd20baf2514d37b SHA-256: 651b03da95690b771af141cd7cd4f2b84bb1d45323e30b1c802dd3cb37ec66ed
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The presence of a specific URL related to 'spb mobile shell apk download' suggests a potential lure for users seeking mobile-related software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://ka-base.no/images_students/files/zemokekijevukuwanibo.pdf In PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/5643c1173aa3a82352686177852177ef/87981939144.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/76932708159.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/25002753377.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/77694702857.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/furegubanurepo.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614536d298379---panamuzi.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161358d21e0d11---58562771883.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/kejunok.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/85881151807.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/nusosixugupivuluw.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/newuxidupudopa.pdfIn PDF document text
    • http://packamate.com/userfiles/199809057.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161350b75576f9---97576863474.pdfIn PDF document text
    • http://irths.com/upload_files/files/bewawewexijuxarodajuze.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/jazedo.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/kuzuwi.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/61155295145.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e54b4463d3fb37e98bea62273bbd448f/muxisotejeguritakerimi.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/84592385149.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a02a47fc7443a2125bf3fefa7523b368/35990060383.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/luvaxifawabijumimuzed.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/lunakawonitubiwu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f6ccbaec7---fifozukevolavit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=spb+mobile+shell+apk+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE208 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_02_sfnt_off0000f7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D8 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729
font_03_sfnt_off00010080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10080 10852 bytes
SHA-256: 9c166736d3d4fb769d20bd8efdb4aeb4ce28078b640b7dad2c67b5a686a625d1
font_04_sfnt_off0001191d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191D 22288 bytes
SHA-256: 0668188ec97e0ae171d84bcdea75d1231eb19669b8f98064767b4bdf5372f660

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