Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ba570f30567471…

MALICIOUS

PDF

105.7 KB Created: 2021-09-06 13:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 91a1841ecace37a157372f8b9f83bc59 SHA-1: 3afc0ae1254ca04d4a9fedcb5b3011cb66e702f4 SHA-256: 73ba570f305674710e982557d8396096b1ade0ad94a7430d34bfb7fe653383e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect the user. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://irlanc.ru/uplcv?utm_term=civil+engineering+material+science+pdf PDF link annotation
    • http://aivieksteslaivas.lv/userfiles/file/85833238044.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115805464d68---33602644761.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/kemivedekopa.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/xisitotosewez.pdfIn PDF document text
    • http://cecev.com/stockages/files/45013331941.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/melozakijawef.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c0ab407dd917722d1b1d6b79e2be8d12/mojovazoxanazuzixomow.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/uevglerd47prdkcdrk48jea6mt/kelojalesowozogunolawog.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/699884c6c88a9a55e8da0198d165aa8d/54567625287.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/41814554141.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/xepawixiro.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/90363849185.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a15c8b3bdb---43098230691.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecf463def44---29835171846.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/a0843af9012c51dc627c939c88c6b3bc/xonalogad.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607973151bd8d---texojigoxazi.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/28357768582.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/081155143834.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/11719739662.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/gobunanosunow.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/tebux.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072030276923---92519105361.pdfIn PDF document text
    • http://ranchobg.com/img/file/95349117240.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210604/file/72679463051.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_off00013204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13204 20544 bytes
SHA-256: edabab48ac8e7c59f02ee308bb1902ea84fe54ce5629528048bca618ba4587bf
font_01_sfnt_off00016796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16796 10940 bytes
SHA-256: 8c2612f1cadfe23a5419edf3eeeee247a9247b3ba040faed1c0b7371a4cb7386
font_02_sfnt_off000180cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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