Malicious PDF — malware analysis report

Static analysis result for SHA-256 6add8932ce94d1b3…

MALICIOUS

PDF

89.8 KB Created: 2021-07-25 07:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d8b71e36c6dc68a8a851c61441f1c090 SHA-1: c5fad1d12b2aac7e98ced2fb328a42b597df5cff SHA-256: 6add8932ce94d1b369128e8e53ae52e16c5884ca147fe6010927ce741bf070f7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs and the use of compromised CMS upload storage highlight the attack's reliance on external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b496fcdbfd---mesojosom.pdf In PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/8966719420.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/pitopavo.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/b54361e22f4629fd13e176003cec4f98/jezinupozutebodusamodeba.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/dumupibulipinozozurosiz.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079359901c99---4386644562.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/99507700925.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077389840778---semorejixisizux.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf90ceade0e---nezumupiritotosase.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/62895403623.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/62a43655de497b68843000bc54ffc7c5/75138125052.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/8449758917.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac243410b3f---70338589190.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/wukanesadavivosu.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/othpjirpdsmeh6uhsqn6bhss4o/92109483979.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/lolakakividolujab.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab85fcda24---zuzetok.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160756011a05fe---barijanetakujanuvon.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/witizokubazabalun.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b6f9a5b7c4fa5f6843907afbc2a236e9/niwawukofegilumisate.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106111213462672.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/56324198951.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/57880897692.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/rlci2516c2d59lqniei1kilkat/daboxunififanuxasegiwov.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf5c302151---20621191054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=descargar+la+saga+de+los+androides+dragon+ball+zPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 17732 bytes
SHA-256: a05bc734f8896b0561bbc6fa726c50ffbb6dbff836bf8208d3487f8ec2364049
font_01_sfnt_off000125d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE9 10648 bytes
SHA-256: 58df0fda59900e11f4f4b2c6b5d587b1fd300f1a451d4a928522e53da539dd97