Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0535e1cf5bd0d0f…

MALICIOUS

PDF

87.8 KB Created: 2021-09-05 03:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8404de413c5c4293f77cd3a1b98a9398 SHA-1: 779f1af0ff22549685eb546087281b6f3ab12f2f SHA-256: d0535e1cf5bd0d0fa8bad4793909945b8f688ab88c69c16b01252068bd0d8f95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the PDF_URI heuristic further support the phishing lure. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=cultural+anthropology+textbook+pdf PDF link annotation
    • https://ajitcoatings.com/uploads/femagukonajurelagusefux.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/34462678438.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/33046688565.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/6338181488.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/xomidegemukujokagaz.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/22268482127.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612776653f706---52852453127.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3d47b47c6---20098260231.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/92427922730.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/kudegumarebavoporabewi.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/fufukupavuzepulemogiju.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf68ca4c06---fojifuroraxojepebujinus.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/31859143987.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/qhcd787ainmkvhhl4a7m6gcpq7/pivofulanedulipulemusaru.pdfIn PDF document text
    • http://pasted-radio.de/web/files/zupemojegesanevep.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/61062722869.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/76372556468.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce20b750e6---55013898667.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/pg3p21mg3rrlpadvdbsse36gtp/3282868287.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef7106bacf---14816044458.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/53113042913.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/wokema.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/vuwalixijavesuvipovuw.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_off0000f328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 11096 bytes
SHA-256: aa749e4b20f5c21dec577442bba39c1fa4e6a7bf35aacf84820d933e44ea270b
font_01_sfnt_off00010ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B3 17156 bytes
SHA-256: 31a1942a14a6248f33a5aa75fa939722af5ee15e3c864494f94478d5eef9e746

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