Malicious PDF — malware analysis report

Static analysis result for SHA-256 db208c428d54692a…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 07:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 84ef0a93b76c6ad943a5563ca2320bcd SHA-1: 549b8ee9a2493a3722ee4a60ce0f4e0e7ab523a6 SHA-256: db208c428d54692adea2d0609747bcc94e0713f80f2853f7f44696e379626062
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself does not contain readable text, but the presence of these URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c284fadeb429a79e1201f9df08e9c18b/65450707755.pdf In PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/8d42f789cbeeedff77dfb1cf30057433/xowewinuwenotuxoliwi.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/xoxojofogix.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/keguwokafubeze.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b22b9e82c4---fegedobarojojipezolo.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/d594b3ec457795395f3bc8cde5308762/tulazavug.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/24464550043.pdfIn PDF document text
    • http://learningkey.org/userfiles/xoxadinudemalivesetokuw.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ae2945f249fbddaf21f35121e3e1d3c7/mujutiwopetivol.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/79732685372.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/powolonagejakojiduvemanum.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/7899b67ca9d96936e3718ea73e610864/7326577942.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/35d99f1bc5cf33acf69313e53b551aad/42596074545.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/100153519331.pdfIn PDF document text
    • http://fxlcd.com/upload/file/lixofefasolixopesaxi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/574ebkbbc2nhttbdljgisp4rg2/22482970866.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/177fba2f34c35884d6653b4f7fc9174f/18174742178.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836a70c8840---55777273078.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f96c3707cd---30158786580.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/c8d772942ede1979884681daa27f7a98/gukumodiwawewarut.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/384fec869134b61fecdedea7f3816271/63287167248.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/3cbf2ad0edc3801fcd1956ccd5879b11/96587290440.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/51258168578.pdfIn PDF document text
    • https://lavaecucebrescia.it/file/fodorepekenisovudaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=solving+multi+step+equations+with+variables+on+one+side+worksheetPDF 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_off0000dbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFA 17880 bytes
SHA-256: b718cff25936e4eebbb9b67e1a0f7406bbe866c4f5823cb06c12af0293784cba
font_01_sfnt_off00010aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA5 11544 bytes
SHA-256: 195d808a1958e492f2acd84cd4d28e965db514e51cff1cc40615bf559838b787
font_02_sfnt_off0001251f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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