Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b157a1255d99be4…

MALICIOUS

PDF

107.6 KB Created: 2021-06-28 02:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b6ad0735c254d5cf7036f590b974ee8f SHA-1: d9b661fc2f8561e03a0401d673f596128c935638 SHA-256: 2b157a1255d99be4ec47ba668c2e4a1d56c62cafd56963b6e6ca1dffa1fedcfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9279

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://dla-pracownika.pl/pliki_user/File/12031176072.pdf In PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e830d3e0ee5ea28a78e18dcf5bbb4154/saxiwatedewarep.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160843a9fbf68e---darubegowo.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf40badce6---nuveserigixirudowawon.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/10598615758.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/erqnu5uat7jskcv1arj2tt6fl5/galokefitejixexo.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/84d477afeb367f01faf779a70707b0c0/52212465779.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/ed3fbe677ff0cd2a07706fa9435f64b6/81369199700.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/lurokonotefupatepozeru.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/97ed4190a7acd300e9fc95d8cf67ca17/58995128729.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879747b793e---powuzekalazamu.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb11280fe---fibusufanabiweza.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/a9kf91fnv3crnimutpskddhf60/fofumerefofuzunezidide.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/38209985590.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f18fa731c---26486181483.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/883af63105100d5e90af17acffc092ff/86072029290.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/referiginowarozewupozo.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/8628500531.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c61bdb52d46---49052549340.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210623/0634201442.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609261354f0d8---46870847149.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/5be35bb25e3f4a5f623549e155380e49/konuvovanu.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/64051051194.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/julageduzexuwenaxagutev.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/20269385374.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/03bd10eb23508b1cc611bd44062ce811/bolupozefejijataruk.pdfIn PDF document text
    • http://artside.org/data/temp/file/45276490072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hit+the+hardest+meaningPDF 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
stream_003_off0001142c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1142C 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 9340 bytes
SHA-256: 7e5c7b2d0e0e54212230edc8704ed40bf9e724c5e39273d14f0bcc0615d71fab
font_02_sfnt_off000131c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C9 25316 bytes
SHA-256: b2643c2696638d6e575e3230545d3b62f74f50363a28128a185d3c4b59f904c7
font_03_sfnt_off00016ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000186dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186DC 10520 bytes
SHA-256: 80593a7aa640500a5fbd17e328f9308e02eb4dd4d17d0e69de519d34e46eaa40

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