Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8f1b1b0a9d50fc…

MALICIOUS

PDF

83.3 KB Created: 2021-08-29 23:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0af0f933b8d4d9581e6c92933fdb1c27 SHA-1: 8b0572411d090c50b210e3cb71bc3e0ffdea4a05 SHA-256: 9d8f1b1b0a9d50fc431d0232202c318db7e03fefd68f31e6090196ec509d6aab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kit-veron.my/ckfinder/userfiles/files/lerinafen.pdf In PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d98c30e3a1fefee1ab525bd9768f31d1/faruxamotigefebanazikefe.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1c347f38d---42246348279.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/bedd8512c592aad51006d4bfff17655c/wozikogigujusopaniduk.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/datipew.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/xujegofasetatanut.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b5c376820---bolivedupobinawupevukubev.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0a05a54fa---nikoxupuwuwedaragilop.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/79881379961.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/33122927900.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee334728c6---wolejod.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/22dvvmo32tjckj3f2c23fi09tr/24250444447.pdfIn PDF document text
    • https://aspirans.com/files/file/36023106756.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/35845438523.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/xiposewoxinorezerumazes.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/2500fe2550f0daf1d590b145a16886c9/bekoxejusilixitigoloxoj.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/70729757754.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ibal.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/4b92b329a144a4468b8d0a79fa473357/98660844383.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/fonimiwuramunurarikotoxiz.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b99510d7a68---xugutopabas.pdfIn PDF document text
    • http://ezibra.pl/upload//file/98706251293.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/fobonojibixojekujo.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/liriruluvorow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=cause+and+effect+essay+about+happinessPDF 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_off0000e10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10C 17188 bytes
SHA-256: 79af2ecc995c578e18635e3f3bff2945d79c9f27543160412cdc642cd21f31c5
font_01_sfnt_off00010db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB8 10956 bytes
SHA-256: 45ef9af89c6734ea603e92a782e95a8c70031009d12a57b17e22238d80d056c8
font_02_sfnt_off000126f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1