Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb9938188f7957d…

MALICIOUS

PDF

158.6 KB Created: 2021-06-27 11:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a60c8f81c8a6f63f290634cab656efb1 SHA-1: f46ce673615ebc630f6de3650d22cf96f42eac10 SHA-256: 7bb9938188f7957dac84b44ae125a4c1b2f951b082d3c334fffb275f64a3ea8f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://laborke.ru/uplcv?utm_term=eve+online+pvp PDF link annotation
    • http://am-assets.com/aom/magnolia/userfiles/file/toxisavuxaladolulareros.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/93622886001.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ef2c0dea5f3fc2344dc2d4d6d8e18d58/lasad.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/65496513465.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/rutedup.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70b2db6406---jibizujikojuro.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e91bae4412---56201621965.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072d09ef0b9a---gelevopugezisoluz.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/bukebuxomokalinivasil.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/40146407629.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1ddd02278---6069350433.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/70057956730.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/81ba4981664e9677f594b1b00c59dd07/38390261411.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8da35e005c---jigakorigunetikadimave.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/babopes.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/3a5c29uhb2vo7hvbst2r9o7j3c/40912846204.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/28c96481c24730648410d7c367773076/falureg.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/an8stju54i5msm9aphkbgf5cbg/75492356737.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/tifawamomagumotofavezupi.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/86kupqb79a95abcbu445vdn143/vonubufix.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/sng13gps8mnudm72esh7pvq040/vovofinunagid.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/87723329649.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/79e2d740a58a89d9ca61dd3920c2c90e/29050161220.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/94172514591.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b871e3113---17845569377.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_off0002120b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2120B 9768 bytes
SHA-256: 72757c5638fe6fcf81ca32cbbf6bb62fc7ed1c51b325e9ff8232f268e23d6f6a
font_01_sfnt_off0002276a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2276A 17488 bytes
SHA-256: 26faa64838c0b398cc1668b7be90c5922b371d82eadf9e7f08e38b2a654b0677
font_02_sfnt_off000254fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x254FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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