Malicious PDF — malware analysis report

Static analysis result for SHA-256 929a8a8b2a807387…

MALICIOUS

PDF

94.3 KB Created: 2021-09-16 04:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 38f0693dae7cec0d271806c94616315d SHA-1: 8085763e57859f98fc6c44732aea17a760d65db1 SHA-256: 929a8a8b2a8073874ab89b64fbc4c6ef912bda7e311db0c30a70b3c1947fd7b9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, with several heuristics indicating it functions as a link farm, potentially hosted on compromised CMS uploads. The ML classifier strongly suggests malicious intent, likely to redirect users to malicious content or phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 5

  • 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://www.fonfe.com/uploads/files/37801929575.pdf In PDF document text
    • http://erpos.sk/data/files/wezekiminu.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/40ff61f8c9ae937273dae1a42a0488fc/mogajuresukodopevifajoje.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/76329718498.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/fagibupe.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/64791718257.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/xukigogamevavetonuzoxo.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210913214552.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/gadamala.pdfIn PDF document text
    • http://dejede.com/userfiles/file/48839366365.pdfIn PDF document text
    • https://koratspring.com/upload/file/wusigabexatawid.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/e1583ecaad28dcf8c6554c16b6aba3da/tisunenobixatukit.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16134ddc717f6c---45954031119.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141491072b68---37992842135.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/40941354832.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210901111005245595zilsj6f8210o.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/tukonikaketafotopaluragug.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/82024612049.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/teraxowisonituw.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/9a7d4f8ac561c94b450b0225846e4c3c/20776700359.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/58486085539.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/46656432793.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d9a98e2c1---dupuja.pdfIn PDF document text
    • https://ubranni.com/uploader/files/13457571941.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/98239944913.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/pudubijivemorusigudogedox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=roms+de+neo+geo+para+androidPDF 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_off000104ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FF 20496 bytes
SHA-256: c382250d29e9f954458d46698fc157617bd6b36901900ced56d7cfd9ac96da46
font_01_sfnt_off00013b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15337 10636 bytes
SHA-256: 79a597360f0f8b5866406708fb35a0ccf51c8346c57c7ef5dbdd2d955e7c8c8e

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