Malicious PDF — malware analysis report

Static analysis result for SHA-256 722dae5d8ac3c68f…

MALICIOUS

PDF

81.5 KB Created: 2021-08-27 23:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 209ddd62eaff7cf9ced596cbafa56382 SHA-1: 00d351033b9c8947811b172270d32976f551f3b1 SHA-256: 722dae5d8ac3c68f664d0af6542a0b2a53cc119fe585fde09de6a74a2ac2701c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://queure.ru/uplcv?utm_term=astronaut+in+space+2020 PDF link annotation
    • http://vekosgroup.ru/userfiles/file/90596150319.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/naleviwo.pdfIn PDF document text
    • http://spharma.ua/files/file/62430652204.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/0mc8iolsf8q4apm88ug3bmmr24/zutulev.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/wonuzoxe.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/zilanigagetedona.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/72965398494.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111b3fbe65ee---wururutaluforipoxamowi.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/visexetigefad.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d839c15191---finiwinixupaderipid.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f955d46c48---47685325165.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///63138755176.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a70590bcd5---rovor.pdfIn PDF document text
    • http://www.eventoptik.de/upload/files/65739852947.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/59506754931.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/30902992836.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/46351924645.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/lidipubotivunuzesebovixax.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/ragedabuwadezuzetanike.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/82566998868.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/zufobizuf.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/zumakurefozetubupopusoki.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/65779595986.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16115896c0ed6e---91114546441.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/zukutujufer.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/2512627069be91ecda96ecdc6617a57f/lidaburubo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD240 16712 bytes
SHA-256: 0e6712769e1d25f412ffa6b81c0b9603305b1279f6d95905b5027af0c7fc56a0
font_01_sfnt_off0000fd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD98 10644 bytes
SHA-256: 651f48516370aff9b51890962c51c71dc9f7fd10655add74b3f4e635eba64940
font_02_sfnt_off0001162f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3C 1804 bytes
SHA-256: 40ce09ec31e5c9a3fb5e0f5b15172400635f0acd87b1afeadc5119a6a0df2b9c

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