Malicious PDF — malware analysis report

Static analysis result for SHA-256 624ec529d28d60bb…

MALICIOUS

PDF

80.0 KB Created: 2021-09-04 17:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7a79a502043d98b49e78c461c738aef3 SHA-1: 94eb90a5ebb82464033b022a5bf8073cae2ae6b2 SHA-256: 624ec529d28d60bb62a2e7ca9543f2c2abd6a6a21a97c8cbc9baa133cde4d567
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/6fffcf3426470150146e1203da17741f/vesusujugawepupapelabif.pdf In PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba881a28d50---gawanunepawenaworikoba.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/tirop.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/86005717591.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/8fa2dc7217ed9a893eb03bdc153e00e7/zozetavavonisulisegotil.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/69184595755.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/24864065418.pdfIn PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/76832316842.pdfIn PDF document text
    • http://platcometals.com/images/file/44414440069.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d44a55ecac---regavogisezekiwevamif.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afd6d1bfdd---sawer.pdfIn PDF document text
    • http://budka39.ru/files/25956932122.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/46809585156.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1d454f693---gifizukavivimezafenuv.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/ffbd545bb0c7c70e3b6a24bc175c7d22/52881141370.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/86920875834.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160738c23f0a96---78614970695.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/widigovarogikarofuvi.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/62192974582.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/20116415124.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160820205a0305---gofuzij.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/kunev.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee61713ed06---92608906502.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160770fe85e7da---guteruritejadevomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=osmanl%C4%B1ca+%C5%9Fiirler+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_off0000d21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21E 10876 bytes
SHA-256: 5acd7e12ea8e8ec63c9928b7b3ad4b64b1d6a44e79a0c5e3168ca8247b42967e
font_01_sfnt_off0000eaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B7 18736 bytes
SHA-256: 863f3510e24917b70ce15a8e9835ab42d7f930c77ac51855241ff302be7a6e42

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