Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e224634f2e3aa85…

MALICIOUS

PDF

86.9 KB Created: 2021-09-03 07:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7023a73bd3d5b1cc0d33fb3c4767586d SHA-1: 9616391cf720a558b4f5bdc4ccc8be2126bc55d1 SHA-256: 5e224634f2e3aa85aac6db2b9823c9a233228d523fa65fd0f29213859433320d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or SEO manipulation scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://agataklimowska.pl/userfiles/file/88625913266.pdf In PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67618f03d5---sujizuzivavibikasez.pdfIn PDF document text
    • https://foulardfotografando.it/file/30153256835.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/modinidi.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d58c27f93---89868249511.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/827ea5a8fb5f5b632871cfffb3a21314/90443826854.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/67076201209.pdfIn PDF document text
    • https://temahr.hr/files/90901697531.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606da48f3e48c---reradimabaneligimujemorej.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16075c294d547f---jupuwobovozupemonerareve.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2d8399244---xusiterezudixosafor.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/pajizivewotejofal.pdfIn PDF document text
    • https://infotechbg.eu/file/50730563545.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/dokefogopajigamiligi.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/94b612817b24c992927a27ab864eed18/ziwuzunurafonu.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/93989927806.pdfIn PDF document text
    • https://7m-shop.com/userfiles/file/raruniwejowobawekazu.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a5f697bc0d23ed9726a5c62bd9b37d8a/19326200947.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/66936962089.pdfIn PDF document text
    • https://kristinanamaste.eu/files/jaxej.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/20642542888.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/lefenegumu.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a337de1ef3e---59465372864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pdf+metadaten+%C3%A4ndern+macPDF 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_off0000e5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 21864 bytes
SHA-256: 65480197b4ab8ac45565ee87f859a91159493b03d3d483b61cf0cae65176b193
font_01_sfnt_off00011ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F7 10468 bytes
SHA-256: 943d8e9a371196371767c400b0cbc5ed2ff624eb2549542ce475b214b34897a3

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