Malicious PDF — malware analysis report

Static analysis result for SHA-256 9878cd68673657d7…

MALICIOUS

PDF

83.8 KB Created: 2021-09-19 01:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1af31a33eff07abd31f279989f585761 SHA-1: 10ec60fa194f99f1b68dcd404b31545532f2e77e SHA-256: 9878cd68673657d7a3f31f24d36118b19666b35847e89bb579d26426f9ff395f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it as malicious. It contains a link farm pointing to multiple domains, including compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. The PDF structure and embedded URLs indicate it's designed to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://laborke.ru/uplcv?utm_term=music+sia+full+movie PDF link annotation
    • http://autoscuolepintozzi.it/userfiles/files/68050251561.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/82778750039.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/37518994095.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/96665653025.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210909182133.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/xozoruzimebobobunulorab.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/42776508125.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/towamatoridiref.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f595ea14f---goful.pdfIn PDF document text
    • http://montesantangelo.it/files/files/fudefubobivurino.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/83052030208.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-2/20210902080210693853.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161328e9c43342---8205078086.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/61038606058.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/33917700150.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/dukonoteribozugosuvoka.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeb4179bb5---salusedesasar.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/79342009636.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/liwubomuzepepof.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/timebebukefuvozejewemuwi.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/22542803061.pdfIn PDF document text
    • http://insei.eu/userfiles/files/7974248835.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/74331303598.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/nabiwidebo.pdfIn PDF document text
    • https://academiesutherland.com/userfiles/file/1499793455.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/93977266342.pdfIn PDF document text
    • http://lex.tj/img/file/21139360735.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/xoxumezaruzugez.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_off0000e288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 18428 bytes
SHA-256: b4d20b83f9c7df233ec12c4aa9f8ce8fd9353a418f0f4ed71cdaaf4a1c397d7b
font_01_sfnt_off0001122d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122D 10356 bytes
SHA-256: 32c2ada6a25c2de35b6bfaa67c9834bb6588f8568c1d7a03b84b5693d2ea6529
font_02_sfnt_off000129a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1