Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b6af4f16efa783…

MALICIOUS

PDF

82.7 KB Created: 2021-09-12 04:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1b9da30ecf074400bd7f8d0840459d57 SHA-1: a3828c3af49e1b0228799e3cad5febc1188c5f45 SHA-256: 64b6af4f16efa78357f3b67f7c65bb3fa188824c07e9b89412dc877a17dcad74
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body is unreadable, but the heuristics and URLs confirm its function as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://huntic.ru/uplcv?utm_term=angela+hack+game PDF link annotation
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3d9a63d7---41841749466.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/f35e8fd20289b897ce1d88a422952522/duzod.pdfIn PDF document text
    • http://chieucoingason.vn/files/9213264523.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/1989019210.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/90258139830.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/goreni.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/segufenerekuxotazu.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/89039383077.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/07/42392668075.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/21234942110.pdfIn PDF document text
    • https://network-italia.com/file/77677422649.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/aa3a662dd2f6e45ffaa941ad8054a885/31282208810.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/12780231128.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210907_055715.pdfIn PDF document text
    • http://state-lithium.com/upload/files/53564315536.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/wafapef.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109041255485645.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/42613122901.pdfIn PDF document text
    • https://lazerom.pro/media/file/85100085928.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/25998682709.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ajm3p525q5hd9l9mgb3v3lmcp2/33170309402.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/navisisirupoxatarumewiran.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/lominotudowegoxaredaki.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/najenamagifapigoga.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/44754625482.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109041104251131.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/75190655492.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_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 18312 bytes
SHA-256: e307fa06127a0ce800681618bd79241c61d9ccb9863c489a3c9403d17dda841e
font_02_sfnt_off000124cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CD 10172 bytes
SHA-256: 2d95afb43230b38060037b2aa67e3b2199d7b791fb6108b5abd67008dd2eaaef

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