Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f47a072abc0512…

MALICIOUS

PDF

88.7 KB Created: 2021-08-19 20:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: fed930b80f3c16ad1d2e43fba89c8045 SHA-1: 98be091f0287a5403c8fc43a9a3119fdbc1244e4 SHA-256: 08f47a072abc0512dbea579180c2060cadc39655b07002b160b71d1068ec3fe0
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/pemkpbcu546phcka5fpl3fdae5/32220670286.pdf In PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/8353404637.pdfIn PDF document text
    • http://fygl.net/uploads/file/15182316325.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/3489aa92c206fe5348addb3c8deca0be/66960492259.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/57035547745.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080b17007287---libesibelesoxigobegegot.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/pemibutamagamawazipa.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/q1v7leh5mk94b1la685joe9mdd/pizotesaluviti.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/99011700463.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16108816b640c4---bazaruxiwimekogilulubujo.pdfIn PDF document text
    • http://immopolignano.lu/images/ginikowetaketo.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/dobubidojegawowaf.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/durim.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/8b4e9dbb0c4612e8b6b23f13474abb22/dutuvabadubidokimuda.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/migibitepegup.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbed7e09bd8---vovojuzaxulos.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/34041224731.pdfIn PDF document text
    • http://anm-av.de/uploads/files/58033451214.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/jedamomizi.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071a6094cf31---67901980503.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///wuwimeboratukutov.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/mivitozaviwivimozupolo.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/fosibedapawikevuz.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/gelozowuzofesomej.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/98a7eafcbd30b4c411ff871ce9f47f23/weluligiwojulat.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/v13voi8aqescao41e8e5q6ljm8/58339510323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+twilight+saga+breaking+dawn+part+2PDF 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_off0000f645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 17316 bytes
SHA-256: b3f6d53e8f527f4771ec828cb7f7ba5509db97f0a0dfa8a69eb5ee250060c382
font_01_sfnt_off00012366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12366 10952 bytes
SHA-256: 6564b370c24e7bc44e9a686be3e3f8ffb79fedd19c6cc287aed38da89eda00fa
font_02_sfnt_off00013c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1