Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0a4a4efabd6166…

MALICIOUS

PDF

100.6 KB Created: 2021-08-12 07:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b8080633af216c63266883c558f83bfa SHA-1: da06a6722fa619f3a5de57e5394a7bb94f761ebd SHA-256: 8c0a4a4efabd6166e4040e450c3dd888d05e63b68307538aebc0df3e9b3e8f98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised websites or are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and does not provide direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://syuncyoku.jp/upload/file/64402968291.pdf In PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/devozosejekaguzubarop.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/nosuzosibipexisogaxajatuk.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/nofuriwusen.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/dk9rdifljtkl3rt40b4p9s0d3b/bubatad.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/kujeluduvokotudasulo.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/801383542.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4e87a85a4---lirilog.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad8ac7da34---91682002322.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/fularupexesefino.pdfIn PDF document text
    • https://magnificenttreks.com/userfiles/file/lutosagadixewibiwafaduf.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608486251e0ff---27497707246.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870168a1da6---jomogotifinexoz.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903294b1454---43495151308.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/66245903333.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609449106e231---51719274996.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/lkqj6nms6bshpbb17jj1u87gf1/fezasinuvudinejitojuxison.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/75069965406.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/lapikunixezem.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/13378686406.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6d57c482b---31002416915.pdfIn PDF document text
    • https://atl-50.com/files/file/zixupoz.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/vupinokogomezenaxadexaj.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093852138dfc---momubixa.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/gijalivug.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/60193044634.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/97582720131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=bunkmate+surprise+answer+keyPDF 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_off0001271d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271D 17248 bytes
SHA-256: 39ad2af05606d9d715592f51d5e809b3dfbf9259f745498b5981cac2c6421427
font_01_sfnt_off00015401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C18 10692 bytes
SHA-256: a2b7421add9ad80ee898bea68ff99d7816ab7c187f6c90f163b0280f441ef05f

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