Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e23a14ec6fd5c2d…

MALICIOUS

PDF

86.2 KB Created: 2021-07-05 23:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 11992f6e84599eb17a7ca495f5eac454 SHA-1: a255fb42a745a09e4cfd87fde81e94ecbc55fef8 SHA-256: 9e23a14ec6fd5c2dd06789a3a850f4300f437de3f8ad33bf0d3221f262a90c5d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://peterdegendt.be/file/wezumatowo.pdf In PDF document text
    • http://hy-concrete.ru/d/files/xosonewusaboxojulax.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/dd599f37bec5853e60bc0c4bc9bea32e/42181913989.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608d340006605---14565373783.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/68051544744.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/71755026890.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/1530692017.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/24b3d7b573e7715cdccf6f43526fafb0/98363640345.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/da12b5261faeea5da8b983e313669b5d/rumigoz.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/89355385727.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/sutipolutasav.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850e361d957---98522300562.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/1e4eec2bebfd759c04e38046b5bf0d1b/kavitufutizevewajaf.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f9935cb5d---40139296653.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/70276873411.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/81e0b41a887e34a8034a71b1848540a2/16983085987.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/jcimardbugs4lhho489ibnkv88/donesikakefulujenixazux.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/nrvbbkpkk7m42154c0ldndl0u5/fatawobixamedunaberowon.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/76506265528.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/qtn4djq0gkqcfgmg0tofhultug/putolonen.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071eda2bc51e---kanolovanusavax.pdfIn PDF document text
    • http://digifast.cz/userfiles/75123992901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=in+shell+and+tube+condenserPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/15648758d8c605d0a10b10f09702d3ea/85546412614.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_off0000f0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A4 10568 bytes
SHA-256: e32388e5f297527b41837609b5b09f73bdaf217ad3645bc11a83481148c406a8
font_01_sfnt_off000108aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AA 16484 bytes
SHA-256: 61b6c6897101db2c3fddf46d74454d7dc726f032cc6eb56a765fc4b1975970e4
font_02_sfnt_off00013372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13372 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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