Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d849a6442b294e5…

MALICIOUS

PDF

95.0 KB Created: 2021-08-18 21:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca6c8bf09140d07a47f03147b464a76d SHA-1: 91ad6f7f4aa9fcd609c6138cc73d423177a79f6a SHA-256: 3d849a6442b294e5f63501fbde309b5df7e9b449fbcf3723e47dc972308d2609
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF with numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm for phishing or malware distribution. ClamAV detected it as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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 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://cortabellanews.com/userimages/55650851702.pdf In PDF document text
    • https://dom4m.by/userfiles/files/xenijojemerafukuvin.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/mobatamimasepemevaga.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/2c0cabb4fc7d88e8ed9f1ab61eed311e/64735377064.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/847677aee816a0dbb2cb34e435fdcdb8/36409273742.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59e984b1c---bijenomukiwo.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/nepodowalawokojiripapup.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ccaf4071050---556523952.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1efa4d146---ferikit.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/78692802451.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/peqol7ebmjqtro9jaagr15dvpl/wejatelasolimeki.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160808fbc94663---wazobokajenujefinol.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/12891561805.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/56373382e5864c4d94f76f006dc3ed7a/59672444711.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/89268178907.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/vulate.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/gubovit.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/3753a542aa37fa4b9137e545e59437c6/6198407483.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a720e872cd0---fetotiduwovavukugobanezi.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d85033ead6---17383493357.pdfIn PDF document text
    • https://partnermind.cz/images/files/34458184855.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16107ad5a4aedf---61255327145.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/sulufaxafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=aritmetik+geometrik+dizi+test+pdfPDF 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_off00010989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10989 10664 bytes
SHA-256: 043edbdef777efe3fa2ef7a5740e2147c686054e122fef8d7f43f3acdc3cbca1
font_01_sfnt_off000121d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D8 19920 bytes
SHA-256: 54b4b193cb7763babd54dacaf0ce57be2a5b1893457efc3e7917a40e5a843286
font_02_sfnt_off000153b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.