Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d7f146e8eb4c9aa…

MALICIOUS

PDF

87.5 KB Created: 2021-09-02 07:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1503cb9d1b0fe453499cc56f46f80575 SHA-1: ebea0ce3d171509151fc0f53113ecc3ae9427ec4 SHA-256: 2d7f146e8eb4c9aacd47d690f19993de7d02188e0cecacfb07d4110cda7bf835
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised WordPress sites and other domains that appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to distribute phishing content. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9873

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://renetravel.ro/images/files/28655586011.pdf In PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd203da92c---naxolisiniw.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/jixegupuluzoxelivudetul.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/ruxoga.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/78872172438.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607033c4bb481---juzufozasogakilokolobob.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/1008ee36f3353eaf0aaef896647a1d0d/rilavitogolugozog.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/paratagetodebojotuf.pdfIn PDF document text
    • http://abworder.com/uploads/files/39615123769.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792726369e2---84461156017.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/bunasesixixobeviv.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/cpsepfplgt8q7cfhli2q5gt13r/29622684538.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/fapemojofivadizowivi.pdfIn PDF document text
    • http://jaatkinson.com/userimages/manibisowumobegipudupo.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/kivalusikefoteru.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce64aaa5dc---9263928793.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/mdjcs2ij3f8pfvgf2qfoorv516/22597582769.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/i6o3jud6a7sr3va92d0mfiafpa/84474622047.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/31241159301.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/zololawadim.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/telugoririxis.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2e6de5f1cu4mak2nipl6cm5b4r/49707293619.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/bemerejijefe.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c280797de68---22634125807.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87fc1735ee---21290311918.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/0e244a9111a8f3b0d4d889eab3392860/zigibubeni.pdfIn PDF document text
    • http://splogservice.ru/content/file/15618535577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+many+cards+are+in+a+traditional+tarot+deckPDF 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_off0000e9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AD 10816 bytes
SHA-256: ce836bf4871668d855e39be1ab6d6446fc133871d53f959ae0a56d2f833f2ff4
font_01_sfnt_off000102a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A4 20240 bytes
SHA-256: 9fe5ae8f8054b978e95b211cb26f7852878b021a2c85f95e2933ac2bdc4c38fc
font_02_sfnt_off000136b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1