Malicious PDF — malware analysis report

Static analysis result for SHA-256 808d91a6a92dbe43…

MALICIOUS

PDF

88.1 KB Created: 2021-09-22 14:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f47756eaee86ed05651f8fa0cb7579d SHA-1: 6630203ed24407e361a8a57922e5da7240a87af7 SHA-256: 808d91a6a92dbe43a402a81f3f6e7420daece60d0f05f783c37b91b2b16ed7f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to obscure malicious destinations. The presence of these links and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://gabinetpro.pl/kosmetyczka/krakow/files/73350154630.pdf In PDF document text
    • http://werder-ritter.de/UserFiles/File/xugobusi.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae2fb53415---18641528670.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/95088218116.pdfIn PDF document text
    • http://355353.ru/userfiles/file/20887647544.pdfIn PDF document text
    • http://watch62.ru/files/files/5648269005.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/97169018994.pdfIn PDF document text
    • http://domplus.su/userfiles/files/68852227716.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/xamoxaloxesovode.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/tatikazi.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e347cb4193---61394292759.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/manefopeminet.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/72740231575.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16144e79e74775---38143415248.pdfIn PDF document text
    • http://balalajka.nu/media/sumesetimopimox.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210906/1746523088.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/59911766095.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ca0f1706bd48793af098b72515fa85a3/dufetiboxoxexekajidoxov.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/76410113500.pdfIn PDF document text
    • http://crm333.com/documentos/file/71175370845.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/75070131201.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/vapajuvajudag.pdfIn PDF document text
    • https://ccs-corporation.com/ckfinder/userfiles/files/nobixibatok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=venom+movie+free+watchPDF 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_off0000f5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F3 10508 bytes
SHA-256: 37d7332b3848caa1415c40017cb23d79a0e5cfc25ae3cf65d4cf9c15569de247
font_01_sfnt_off00010dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D1 17596 bytes
SHA-256: 2b1dc0f8ab21b827137a4674e8267d0129832cf5a7c834f56306f445928ae5c0

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