Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e85a7ecddbbe62…

MALICIOUS

PDF

89.3 KB Created: 2021-09-01 21:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 73e170c6de5ae579a2449421387c58eb SHA-1: ff295509c501213efb194a08a922ab62a9444c49 SHA-256: 65e85a7ecddbbe628a4e50bb7937eeed960d689afa9122f37e28157725f1f228
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by the presence of numerous links pointing to external websites, many of which are hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing pages or download further malware. No scripts were extracted, but the link farm structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=how+to+make+alpha+symbol+on+keyboard PDF link annotation
    • http://bayanairag.com/uploads/userfiles/files/77080205800.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/44355364464.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610478fbcab25---binitovaxoxasulimilopeki.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/29608phq4sgn9p08fuogi6fhg4/85085934234.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/dizawamuxowanux.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/15555184808.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8534b9b746---xojevizegafulufejaf.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7f851ece4---65519600505.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/patoremabikojep.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/0gkhc9lpeklt64q7vfcrhm7ge1/26857800482.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/68920407809.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/zelididurubapasu.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/jezegifomowisade.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/sidukanajulofirumegopav.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/13p2t5dic13r15ie6trcvno5uq/fedipubuzaj.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160791b96ea68b---56575440385.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/6ee9e6c89d2fcd52e7d6f0012ca2e0f4/naretuletamozasusewu.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090456401089---wexefonabixajuvu.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/90chrgr2ul73qmqn46t723lgvc/98069036995.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/fivituwewogakew.pdfIn PDF document text
    • http://apsons.eu/files/file/baruxexumulaxamadesodid.pdfIn PDF document text
    • http://machin.kr/userData/board/file/jupas.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/fupumipejivodoranabaxuxu.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cdd76a19d1159c213c90021bc3bc32c1/85306227403.pdfIn PDF document text
    • 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_off0000eefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 20892 bytes
SHA-256: db52820d4e0b7c0e3b222c29975639f2e27cdf32152d8da8ec29b90e24e4d3cd
font_01_sfnt_off00012634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4B 10988 bytes
SHA-256: 3f54e06a13d16b9df3ade756ed94191b309f163c88e1891719e0f94554cf5210

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