Malicious PDF — malware analysis report

Static analysis result for SHA-256 0676b64c02bc4678…

MALICIOUS

PDF

111.5 KB Created: 2021-08-03 03:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9c13d2ea43b1df15f12b733dba183c90 SHA-1: 0e2933a22299eae57cd6e607b225e9691f1b25ee SHA-256: 0676b64c02bc46782106e6250830fdbca12707d570f3ec32917f843ba274ae77
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS upload storage and disposable hosting, suggesting an attempt to lure users to malicious sites. The PDF structure and embedded URLs strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://addsfly.com/userfiles/file/lisaraliven.pdf In PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac372118a3f---sifas.pdfIn PDF document text
    • http://babamoleskine.com/files/file/nakodu.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/dakuvigojojadusov.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/46888707324.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b8086376454---6298308782.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/69395773431.pdfIn PDF document text
    • http://santeh.md/img/files/26369164045.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0f5349467187ca27ce2d6e7dc10fc099/gilibimawirefodijuvese.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a3607d8b2---26830506560.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609416eb18708---6278046811.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/62693380191.pdfIn PDF document text
    • http://www.centralperdana.com/file/xurijo.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608d08ad73336---kitimikazipabajulatelip.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/lamixewodazapu.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/30090697659.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/gopolutobaxaweful.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/bitifemel.pdfIn PDF document text
    • https://mtmhomeschool.com/mycms/uploadedimages/editorUploadedImages/file/1702222622.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29deac30a9---risas.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/mizajizolosurifofokub.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094815de6ce2---bogikenajekitufutazo.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070866fdfb36---takepiwajuforinadegukom.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a73862cdd0c---5810722203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=red+lobster+menuPDF 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_off00014d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16539 18768 bytes
SHA-256: 7e27e3d6e26685c81709aa0a9020c5d7636f1a89f593c2b8f8412eda2e83e07b
font_02_sfnt_off000196c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196C9 10440 bytes
SHA-256: 857cb9593478dc3805b1fc56f353c6b201a065d5fa9443b8dd709f0306772301