Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55f7107c6fe13a5…

MALICIOUS

PDF

86.0 KB Created: 2021-07-26 15:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7e78c9bfbdbb1bebbe01a4b3624e2f7d SHA-1: dd5fb3574dfd3cb2c3738224fcff1d74da310d19 SHA-256: e55f7107c6fe13a5989d242c6f1c7c8a57f2bd8af35a8c11875bdfd4b0b69ae7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs pointing to PDF files hosted on compromised websites, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the structure and URL patterns are indicative of a malicious PDF designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe29ddadb8---91603073302.pdf In PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/nojikufogesododiduv.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/31145972413.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/49697459972.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/42262711176.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/61745906621.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/97767852565.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/kupibovutepinexo.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/1d5c713b4379e75c7b3ae045e48f46e4/leturujuduzizo.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d5f4a9f80e97f9927bb7b4e39cd35267/38527222468.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d4c06f246187771b9738ef927ef2245c/rexuvumofesoloxofed.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/mn02rpb77lc9dskciieekrk913/fotupukukefozamujidalipot.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/vufokifabudiwiviteraser.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/v9jjtbfdgs7n26i2849u53dp94/lidagovoxijim.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609256d1bb57c---minosido.pdfIn PDF document text
    • https://luminex.pl/upload/file/gatokolafo.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/7cmqkbk1ag63kagojfoavp4r9t/55479037188.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/73654418791.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/f7fe8ba911b7781ff2773e39a672a632/77946385724.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502150047176107.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/dedebuk.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a30da1688f---66883179948.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebef9b9585---86485400412.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/21880495471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=www.epicgames.com%2Ffortnite%2Fcompetitive%2Fnews+contender+cash+cupPDF 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_off0000e973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001018a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018A 11364 bytes
SHA-256: e34c7deaab371e2b6db6b2443b0ef40ef98b4394195b74af3b61b0e1db289710
font_02_sfnt_off00011c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0A 17292 bytes
SHA-256: 49aaa635d9b8c5bbc49a1d2ba789a26e95327ec3bfd7665057f3efb7a947fbe4

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