Malicious PDF — malware analysis report

Static analysis result for SHA-256 48d1c9dc725bfc68…

MALICIOUS

PDF

91.3 KB Created: 2021-09-07 04:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7245281f1693237637e1b812e22ca2e8 SHA-1: 5644174f2399759dee75d4f06a599d92c635c500 SHA-256: 48d1c9dc725bfc686b9b986d610dc51dce81f5a9da3f752490f5b251f310be0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous compromised websites, likely intended to host phishing content or distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content, potentially leveraging JavaScript for obfuscation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://synerhu.ru/uplcv?utm_term=mnemotecnia+pdf+libro PDF link annotation
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/gjvq0vpm6rjfulh3khah86o4um/27154584984.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/n5ts14jadajsi3vmilifbn3336/fejenawipanepexijoj.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/pugare.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/39e244126510e25ea646569661e2fd62/29238960605.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/97392123521.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c314a18e2fb7ade71cb9fed70b62ecdc/sotenatobesefum.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca93d9493e---tineloxilavalazedo.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/gafujinimoripobidil.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/53614842200.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///zubega.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607053751484d---2446288582.pdfIn PDF document text
    • https://advik.net/userfiles/file/1874221502.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6854ed235---19788189341.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/kotarobixatejowusibij.pdfIn PDF document text
    • http://contua.org/userfiles/file/dozigigaxareti.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/gifinobudepokum.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/86692555167.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/refasagugakanikox.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b06472e25---donamaxiwedipiwilasirumi.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16071174400d14---xoxesewalekuf.pdfIn PDF document text
    • http://apicn.net/upload/files/12987425785.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/jowefuwidoxokemizasi.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/30351416694.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/60780176988.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/mikozemomebenipinowipu.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/66903159770.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_off0000f648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 21900 bytes
SHA-256: df64cd753a3e33a61f3cc58ba55ddcf552f77185bb48bb52f3aeb1f2ef270d76
font_01_sfnt_off00012f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F05 10744 bytes
SHA-256: 08d2836717bb8515f4feb2087d1dc332ad9aa8722fed06475a32318b04ef6ec0
font_02_sfnt_off0001476d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1476D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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