Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0c80107e8fdd32…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 09:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6aee1d68503f9e48e3d5dbfb7b31c1fc SHA-1: a6b192d1457fc891fe3a301558f045b4bf9154d4 SHA-256: 8d0c80107e8fdd32ee01ada47b102f2d84c93b630697e65d0a4df676e0b63436
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to various compromised CMS upload storage locations and disposable hosting sites. These links are likely intended to trick users into downloading malware, such as the 'minecraft apk for laptop' mentioned in one URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sadhankendra.org/erc/media/2601411227.pdf In PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/9eac8ff240633eec0658ae7bd0d88fa1/19056312743.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/letoba.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/jetewonediwawojutazu.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/80449134356.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/98675315068.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///jigelojag.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/konugiwaturaverun.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/rofuvisiravefavalarim.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__614525914E087.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/52282712875.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/61074384574.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/69598906787.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16146dc18c1aa0---xagolemuguwusulokadisafo.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/dizunitilodobe.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4f8075e4---90735953982.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/xodijepamu.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/81421020015.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/gezet.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c3b7f5af71f5f0832316c0d5fa23ff00/67698505631.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161440368c190d---93161558540.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/13474350315.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16133efc1cc7e4---4536748381.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631799132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=minecraft+apk+for+laptopPDF 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_off0000da40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA40 18084 bytes
SHA-256: b96b991397bdd69d8a3ea532c1b39de232ef05debf35b501fb8942a349d00874
font_01_sfnt_off000109ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E1 10388 bytes
SHA-256: cbf12c0e68d9d9634a8bb1dbf4f4ddb0e9995c6a15f0f7aa0ecedcc2186025ab