Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f42f00b4bfecce9…

MALICIOUS

PDF

81.3 KB Created: 2021-08-19 15:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 05740e594ed648d6bdc8e99340cb2c3a SHA-1: 19502dcc7a8bad7c676b1a082db4f1405be4dde2 SHA-256: 4f42f00b4bfecce9206ee4bffda8d301d1da71e0c315cf4bb69ac72639351a8a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting files. Heuristics indicate this is a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0afd86aae---jajelubanagefogab.pdf In PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/53890681053.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/timexeludikivafi.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/fe02b2a04e218875e01cbd809c9ea99d/witipefibidifubilizuz.pdfIn PDF document text
    • https://themalc.org/files/file/53592729291.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d9cae212d---rigogovosikazizogopubub.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/lk8eqeogll4c79chl039771jem/45253289562.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/zeworivigekorego.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210810223808.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/71310029621.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/gozepakikasuditin.pdfIn PDF document text
    • http://fitviewer.de/files/file/36861887058.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/lasonexuwemoxamepot.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608187ba2eb94---39677516681.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/13316164832.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/dokulisizajazexuxonom.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/81546466425.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/4492898779.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/zuxofulazilereduduwof.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/8a69ee04dc70a1ccef41b22a30460e9c/didowiberugobukuzar.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/6885318746.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876c5703438---44822303554.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/94386455200.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/kewunitaxejuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=dangal+movie+download+in+kuttymoviesPDF 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_off0000da28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA28 10948 bytes
SHA-256: 203e30b125b55af1c55d11ff35765716377a73e17d999d4514fe6f1bb5ffae7e
font_01_sfnt_off0000f362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 16712 bytes
SHA-256: 45ad0c7ff8e34ead80d0d01b368ceed3634771c8f4b75669244f10fe72d61fe2
font_02_sfnt_off00011ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1