Malicious PDF — malware analysis report

Static analysis result for SHA-256 e066635f50037f53…

MALICIOUS

PDF

96.9 KB Created: 2021-09-12 08:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bfd0f2199c0c3b27ef6d48a6b7103bb3 SHA-1: 55fb8f96f3baefa21722568101640d154e50ad1b SHA-256: e066635f50037f539619eed24a6b2951dce1664e6ea79e19c76676cb7fac23f6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/3b8abffbe80cc7189b7631f7b84a1269/96573396170.pdf In PDF document text
    • https://xanbiente.de/userfiles/file/tosugevogevoxezifaxew.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613352815d1a7---17915784404.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/37857727767.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161385466dab94---38678872037.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/popapesobimomudepupid.pdfIn PDF document text
    • http://czyxchem.com/upload/files/47211363095.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/44938491693.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/14436576042.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301142323a0---51782384579.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/80710830709.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/mililekibofuxakaz.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/niremuruwoturesoz.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/25375330002.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/kozela.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1630983827.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091007470873499.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac9d6f2770---9618154983.pdfIn PDF document text
    • http://castel.lu/userfiles/files/fogiwulubanovatikoxil.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d55e2da2a6---34300726901.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/30197102736.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/8858773970.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/dumetobobibolapajaweti.pdfIn PDF document text
    • https://mihalex.by/files/files/tosakenufeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=bimla+kapoor+psychiatric+book+pdfPDF 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_off0001134f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134F 18712 bytes
SHA-256: d53266c92346034b5c2f8f04f8fb9af5360dcb4adf9d430eee2d36d32e0ad8a5
font_01_sfnt_off00014430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C47 11048 bytes
SHA-256: 22d61dac419a18769a5817d5f1690aa9a14e9cb8d3f44c9cf01d8dc0f9df4300

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