Malicious PDF — malware analysis report

Static analysis result for SHA-256 5974a22459fcb56d…

MALICIOUS

PDF

84.6 KB Created: 2021-08-17 03:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 25ce106e496ca0a80b845ec31340aa78 SHA-1: 3b04e2f8e79852b7e5751cfaf185f71055f9006c SHA-256: 5974a22459fcb56d5d52ba61f51e98fc55ae05eaaf74ceac8930b5811fe0ae58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS upload directories or disposable hosting, forming a link farm. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and the overall structure suggest an attempt to lure users to malicious external sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://catamma.ru/uplcv?utm_term=libro+alimentacion+consciente+suzanne+powell+pdf PDF link annotation
    • https://ocw.tw/uploads/files/15144848907.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/magijefuxomog.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/nafodereluma.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/lufafagabanifusizova.pdfIn PDF document text
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/wujojalememimifaz.pdfIn PDF document text
    • http://asustainable.com/global/file/2902857054.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a6146bb9cd9efdee6b5d24042704a6ff/ponijurolajugaf.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/lopafofino.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/fejovozoxuwif.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/5fb3dca1c37d1f5218e5835ecdb6e117/pisidogako.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/rikobijapizewamozulenolap.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/manaxajunumudog.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/fipugopolutozafexe.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/xuwitokonosiranus.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/51267674865.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/904d9976a31ea6429d1c4b318ced3155/50204674117.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/84602989430.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a48e147dbce---votefukonovejin.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610e60ad9911e---kudovanuxiseguxasibanab.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f878d2da958---vixetulibudajewij.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073961ff129b---57831451221.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609441fb7b8c6---30185876133.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/gobusireviditav.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/zepemotugumubolag.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_off0000e304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE304 18264 bytes
SHA-256: 7073ef449eb6bb2590d1850ba6164e03bf6fedee3d8406d904f7171a33330e45
font_01_sfnt_off000111a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A1 11124 bytes
SHA-256: 69b672652da27fa9dac713f72d1e02a9de8f1bc1baafbf37055d7785c708c75c
font_02_sfnt_off00012b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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