Malicious PDF — malware analysis report

Static analysis result for SHA-256 abcf68be4e5898f2…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 20:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b39c8d97a6341c6c6c4096f3f315d839 SHA-1: 8d86eac94a52606134755282f62cbeb2a7e023e8 SHA-256: abcf68be4e5898f284767cdc803f1272a0b05ee4ff1287d4aaeaa992696b206e
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites hosting other PDF files. This structure is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://duhochmis.com/files/uploaded/files/65804547070.pdf In PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119fbf098f82---60076623984.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/47208904279.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/wopatofudarut.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210713205033.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-19/20210719113412482931.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9fb08f0d3689a450f243d1a357eb2737/99345717996.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/nm1ammkr8qrpdma9kh6o8cig29/nafesamomavozotedawadavo.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607612ad09e96---32554498637.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/fideli.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/bomodififo.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/70841185073.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cf0101162---zobamuwulozisijexeno.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/basarelepoveka.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/42322303297.pdfIn PDF document text
    • http://mesterek.net/tmp/47306554294.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/86655363137.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d4895728fa---rosobapewone.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/080b5e640001d73c04d96c80ada423fd/70824125646.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/sefatuminelozoj.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/db6fad198890137ccf6295a1ce6bbcc1/49892388527.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/94373348855.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/14147716264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=kidde+smoke+alarm+i12040+manualPDF 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_off0000df3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3F 10864 bytes
SHA-256: 6f0ed618f63d02dfd219409097f6dbfc8d491499e274adc924dc602e433c54fa
font_01_sfnt_off0000f863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF863 17724 bytes
SHA-256: 9ec710a2f1a08290a6d34b6e9068fcfb502893473642042ffbb47d1f8e153f11
font_02_sfnt_off000125cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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