Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71f687217ee405c…

MALICIOUS

PDF

84.1 KB Created: 2021-09-06 03:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9933cc05f4da495dbaa0852dc5f708b4 SHA-1: f8176f6cc3e644077e4de654efcfea1a246a0ff0 SHA-256: a71f687217ee405c7c3096adad3168a79e89c55a3b2414f638c9bbe5344edcb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/raiqekuhnfac8ilatblpg2kghm/figutajapa.pdf In PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072871f94eff---wiluda.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/73514071325.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1611f35c4876a7---buvazejata.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d68a019956---32737141480.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/kulitatig.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/lewitoziziva.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b012b1255a---76676814410.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab547e4a6b7---nusodumonumetalaxukivesu.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/910dce54c1dc18552ebe2544fd769edc/95677757278.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/78385915404.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/84289228796.pdfIn PDF document text
    • http://dobermanncz.eu/files/tudokulopex.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9e9805807---xasag.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/pinuvikanix.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/30796632046.pdfIn PDF document text
    • https://strechybenesov.cz/content/8808330499.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/datimowezi.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/jekojira.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/45816499242.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/87924969245.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f8056c849---favege.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/73187321112.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a13938a2df4---9743563852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+human+body+book+2nd+edition+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_off0000e3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC09 17560 bytes
SHA-256: 8c3f4698b1f76bc828dcf0c31944d890d792fb1a7542bd418a463b0239fb0836
font_02_sfnt_off00012960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12960 10976 bytes
SHA-256: b5bfe3ad49d5caa34104431cc872b26df8967fb77b975575499d7a1056683e3a

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