Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3df23dcd85f1b2…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 05:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 313f5863012bd0bbab9a7d593bbdcb3a SHA-1: c85309d1ef528619961094b534717d6233a61d0a SHA-256: 3c3df23dcd85f1b2c0ac37d382c8e4e502e8d618a60a3ac0f75a74bf2dd0230e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL analysis point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://duel.pl/userfiles/file/80470533034.pdf In PDF document text
    • http://netmutum.com/userfiles/file/sanunafepisa.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/9fac92ad8932e5050d2e4f7f4cb2cf1a/povokibigesivawulizibeze.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/63835551576.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/potonufosipesituriku.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/ladapiwimasemaxipevunewo.pdfIn PDF document text
    • https://polistirendecor.ro/app/webroot/files/userfiles/files/24507019078.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/mekasefazupod.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f028b9bac.pdfIn PDF document text
    • https://avflash.nl/upload/files/kexeruzeruda.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b47f4ffaf807609495c74bac747518d2/wasekimuxixiwenaralu.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/giwofuvatu.pdfIn PDF document text
    • http://canoeing.by/pics/files/83456599631.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2ab2ae3f0---tegatugowovepu.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/88147715863.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/e2jqi15at1h6chofdjukh0kv76/94771937197.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/2540920308.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/20611730255.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/sobakazezokabibadivubazox.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612941d3e1a23---dununinuzilujo.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/895360c464a13b22fe1cded2228a5d73/93051648036.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/letokukaradupon.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/turemefotuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=difference+between+minuend+and+subtrahendPDF 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_off0000e2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D3 10904 bytes
SHA-256: 912687ef87958530febe5d77ca64ff9947ad86f690d15b53fa5ba422ccc58dad
font_01_sfnt_off0000fbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF2 18140 bytes
SHA-256: 81d35e7858a37ebf2e10ac3d81892e59b18ac165da6716c20f1419048a3a877e
font_02_sfnt_off00012b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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