Malicious PDF — malware analysis report

Static analysis result for SHA-256 2170111ca2bab3e3…

MALICIOUS

PDF

78.1 KB Created: 2021-09-12 03:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9e53211880bd0bf86fc258abb0e58a81 SHA-1: c8f2c8122ef6c34c0af23ad8c5ecf75887af80da SHA-256: 2170111ca2bab3e336b49b62a65dd2fd48e270a118bce0d875f3b575f25d28ec
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as link farms on disposable or potentially compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the nature of the links as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://adirondackseafood.com/ckfinder/userfiles/files/6110282336.pdf In PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/remelakutozipugofujad.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134ab3ff220e---kakenafogekamaxu.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/92938349875.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/dibutar.pdfIn PDF document text
    • http://www.depomatrial.com/file/49837024258.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/28100971294.pdfIn PDF document text
    • https://palet-school.com/files/files/81315005720.pdfIn PDF document text
    • http://artospace.com/pics/file/51208797357.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/sugerekuxakuv.pdfIn PDF document text
    • https://medpressa.ru/files/file/nepuguwedin.pdfIn PDF document text
    • http://full814.com/upload/files/ronamesaxu.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/xiloxufiganazubomatazu.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210904090417.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/56161267434.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/tutajefubazogob.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9b251fda6---23771243589.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/58504859739.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/suwoladifobal.pdfIn PDF document text
    • https://festacontinua.it/public/file/kunijig.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/tojisivosozoka.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/perejosezixibuz.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/64508633535.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/jisowirerunebaro.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f0da40f7f---24527199724.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/84064550149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=led+zeppelin+wallpaper+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_off0000cc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC34 18356 bytes
SHA-256: 37e687ca931169c456e0237ab297888ca24b329adb885a66200f0bd0bf1c2b41
font_01_sfnt_off0000fb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 10224 bytes
SHA-256: b34ab4fa87aa65040adc09f162393c4b966ba2844f8067c14ba4be49fe6ba77a
font_02_sfnt_off000112a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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