Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed0536e53a25e9a…

MALICIOUS

PDF

78.3 KB Created: 2021-09-22 11:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6abf879df4712ecd167a19a38ccf0bb SHA-1: 37bc67e76e79fc66f56f5fc6c6acbb65df68b9ea SHA-256: 2ed0536e53a25e9a8288fac15c64e0bf374bfcf85c435f5fd56cc2a58e07b077
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users through a series of links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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 http://mistral-paints.cz/userfiles/files/52676187747.pdf In PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210901075602.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/sevevinirujosukopino.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/kefapakedopesozerewevil.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/dexuf.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109180628481698.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/xesolejuxifajuxerul.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/62043227351.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140c6e8acd0c---20726160880.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/92129231915.pdfIn PDF document text
    • https://telorgabus.com/contents/files/bowavatatoziganitason.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/zufipewalonejezusizux.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/57648341262.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148e73c83641---10391614201.pdfIn PDF document text
    • http://df-2.de/images/daten/file/povabasujaredupexubixowe.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/poxanar.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/lajij.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/wamidutu.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/kijewonawakaroxitavo.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/75451029324.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/diwidogu.pdfIn PDF document text
    • http://schubert-hh.de/image/file/bopejajo.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135f657c6ab3---gupofadelumuse.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/rizuf.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/nowakepedazujenagas.pdfIn PDF document text
    • https://phnews.ro/files/file/70633887782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=stream+napoleon+dynamitePDF 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_off0000cc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC91 17904 bytes
SHA-256: 81c6be96d4ccaeac9d8a637ae130d1daf85cda7d041fb7b194ab312fbc62ae8a
font_01_sfnt_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 10572 bytes
SHA-256: da65194d5c35f5eeabc3a25b2f3ba197d303e7f288e6089f4ecf4694f9b0365f
font_02_sfnt_off00011336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11336 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1