Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6619411a6a2ec37…

MALICIOUS

PDF

74.2 KB Created: 2021-09-08 10:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8c2db960d6e371299688a5ae1cf2cbae SHA-1: c0334243f9094dab3291a22d9a856808770605f1 SHA-256: a6619411a6a2ec37bd789e39274d432328888f529be63a155b89beaadfcaaea4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it contains links to numerous compromised WordPress upload directories and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs further supports this, likely leading to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://wastran.ru/uplcv?utm_term=telling+time+matching+worksheets+kindergarten PDF link annotation
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/uirrsh16j6egecn9oifge1r2j4/44067113568.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202108191122319149.pdfIn PDF document text
    • http://trickorsuite.com/clients/5/5d/5d84d12f6f4dfd10bbe5497c884a5f3e/File/36195270639.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa868f17ae---xuwido.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/12375753001.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4b03484f7f3eb61f68846ad4e4f2486b/45412748121.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/310e16d3f18a63330288e274f7e4d0ff/19567193134.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/0bd5e1363f1e93d83e2d792f4b06c8ea/disavevofoveris.pdfIn PDF document text
    • http://rotang.net/userfiles/file/rigigesepogesezo.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/69239504302.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/85130550632.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/fogamiderekeguzokalikel.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072ca9ded12c---nabopog.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f634d84ee5---punagim.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/12368184521.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/32311145810.pdfIn PDF document text
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/kurizeroxa.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609579650af3e---73663486768.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3644a32aaedac13a29e6d7f2ea451b25/jogabevisefa.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160713bae54097---xopit.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/11185186479.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/xetoxodazuvusunifabonef.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_off0000c000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC000 10956 bytes
SHA-256: 7e1b05775610ad259eb8d66f62545eaef8d59c14a44db0540b6e16c9f1cec47e
font_01_sfnt_off0000d917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD917 16532 bytes
SHA-256: e430e8b8f667db4c7bf56ee7717587af3414cd10dfa34e883088a323453626a8
font_02_sfnt_off00010347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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