Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b75e4416c4aa670…

MALICIOUS

PDF

104.8 KB Created: 2021-07-05 20:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 031db3e6e8e3e0c2080491ee3057d519 SHA-1: d554ab4e61d10cead49099fb099aee63799fd240 SHA-256: 6b75e4416c4aa6708b33f36ef9ff38e8d8631999b41f2513c8242d17cb0a8910
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress upload directories and other domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://aircond.md/upload_fck/file/xolomiwimudinavaba.pdf In PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7cdf07055---3935370403.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/dekowozupififitonare.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160965d4ab0a44---5060591745.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb13cb1cca---59889031367.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/a6d5119933a2743f918f729ecc7e064d/wosavadam.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/887f4323de2dfe787cc72ec75dcb8ad6/78091476574.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105151906292281.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee1fdde20138c27c5d0e3a5080fcc209/38120245660.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/2939639380.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb4d612354---sezewike.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/romifutizafavalizixeduk.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2nblme79mbsj1uavvkm7ipntm2/gudojuwivubufobiwuwigi.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090883aa3570---33553872665.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3275f57465---jogabefela.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/21232584749.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090acc1704fc---nupalisa.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bd78235df---25420771169.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/43479090607.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/zatuvad.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/fb40c85c8b3a4f9df7e4c4b90a5f33ac/kugotojirodakofavefa.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b44b35661---rupojowexopesabopemov.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/75830649254.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/099499210c8868805092ee34a1ae9e8e/dimexewameliravigotegobom.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/rrlqloag3cjpb2ijptnnkpjah1/mesuxulutekel.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/janafilusaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=light+and+shadow+in+architecture+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_off0001319e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319E 10996 bytes
SHA-256: 326d54e3a894c32c41fbc5947e8537c5d8bbb1b5ab82ff879cf9cda8388be7c0
font_01_sfnt_off00014afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AFC 19264 bytes
SHA-256: e671afff8a978e858385dbdb727fa272f24fc243751186545b1bf7f0050f5a3f
font_02_sfnt_off00017da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1