Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1d547ca03f8b4b…

MALICIOUS

PDF

78.1 KB Created: 2021-09-06 15:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 91b1eb3d81a1e21b9cb2725defe2324e SHA-1: f861b7eb425095213def02cfa2344597b57249bb SHA-256: 6d1d547ca03f8b4b88af4cd3f40dca100433df920b362d9b8733314702b1919a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm or SEO poisoning attack. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to phishing or malware-hosting sites. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://deepex.hu/hirek/files/16175314508.pdf In PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826ea8c4511---wukutasajexujex.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/15567963728.pdfIn PDF document text
    • http://surausa.com/uploads/files/35723910950.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/marev.pdfIn PDF document text
    • http://prograsifkalip.com/files/warozo.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c0f9ec9250fc49271be688979a81141f/48251532802.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/40414144549.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23843dc9b3---bataruxav.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/pib1m0nl7c7jkig6qi1sq5uss6/78921506597.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/088c30d57809b925fe443e34ab5185c5/mabawabubefan.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/xawinazisodetopiladuz.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/44597533845.pdfIn PDF document text
    • https://ghnservizi.com/file/dikexodavalafedefosuw.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/71934c8e84399fbf2792487abb590af5/76606426407.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/f09985a02a77a99e3d09442f410cacd6/74177437211.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ea3e94ba3---13176966549.pdfIn PDF document text
    • http://lovesenergy.nl/file/74030924138.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/getizab.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/nifobakiguwixunotamur.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/kojik.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/nazux.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/nufupe.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/35521221470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=linux+command+line+pdf+searchPDF 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_off0000c98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98C 18720 bytes
SHA-256: 4596732bd778b8778698225d639a7f34b9529a16859954cf6ec186af90966c41
font_01_sfnt_off0000fa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 10944 bytes
SHA-256: 5afeb8f75361d07e5b13b93659935f6d38600ca8a215a5c8710af53e13fa22d4
font_02_sfnt_off00011327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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