Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70e6da27925ac11…

MALICIOUS

PDF

87.8 KB Created: 2021-09-17 06:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fba487bea0c76f4d761d7574f4370f5e SHA-1: 5168f7540c295b882ae1b26262324969959dfdd5 SHA-256: a70e6da27925ac115d5812e5550f57ef68d01fbe9cdc6aca043a293dd481147e
156 Risk Score

Malware Insights

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

The PDF was flagged by a ML classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The embedded URLs are designed to lure users to these external resources, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://xn--b1agpbmdtf.xn--p1ai/upload/file/38103890160.pdf In PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161431451812de---zijimalizi.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210907195202.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/69287368477.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/nofisopupomosopanitida.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/2e2a01eb07b92338a8c60abea6e6c7c9/vivusute.pdfIn PDF document text
    • http://www.programasaudetotal.com/arquivos/file/tedoniveraso.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355154304bb---61277083686.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/92688599261.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/xujebilimijagij.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/6b5e5d5884d69451bddc8a42f05d65f3/81147184059.pdfIn PDF document text
    • http://ifap.it/images/file/97433948436.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/xupavafibafi.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/kitixugagen.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/84608584499.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/xalirakol.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210914135349.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/fuvad.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/71588081905.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161367e2bd4856---melowemojidizewivikotupen.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/51811649735.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/95485929225.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/023e84f5f1992cc9cbde38925cdd9601/78508513013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=browser+for+tv+androidPDF 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_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 19268 bytes
SHA-256: e87595935ff802758d00a1cba84f36d2107dc3bc7bc16d4fbb6420b8f67b91ca
font_01_sfnt_off00012189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A0 10504 bytes
SHA-256: b238b478b19278dd3a3a44e5408b1146f8d7d030557e58a148035f5b7bbd65f7

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