Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75dc40840cd7569…

MALICIOUS

PDF

65.6 KB Created: 2021-09-25 00:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d6341f743f91ce6ef5cc118513f71d5f SHA-1: b4bf537e61c5ea1a657a64dadf2adc4271632683 SHA-256: a75dc40840cd7569f67e276e99c1b2be276a3584f2d9b928b308390bc1c427d6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristics indicate it's an image-only document designed to trick users into clicking embedded links, which are numerous and point to various domains, some of which appear to be compromised CMS uploads. The presence of embedded URLs suggests an attempt to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8158

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 65 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://cructi.ru/uplcv?utm_term=vidmate+2020+apk+free+download PDF link annotation
    • https://perfumes.dropship-tracking.com/userfiles/files/jizigek.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613656562e956---sidatamezu.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/milesarimarigokixafeb.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/47498593064.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/4164966744.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/xifopusubapotipalirok.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/f9d1cedd53486c6719444a4fd4f808da/jujelagifex.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614081454abbc---71520263096.pdfIn PDF document text
    • https://dragonexpressml.apnaconsultant.com/userfiles/files/lodoxog.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/wiwelatavoka.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/tozovomirefon.pdfIn PDF document text
    • http://boden.boj.se/uploads/userfiles/files/58388942070.pdfIn PDF document text
    • https://agros.net/uploads/file/89764880150.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/31425460062.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/razovasagag.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/surugofu.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161470f9179a13---duvinawaxoj.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/kasolitazixetelile.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/nizirejijelutekutipi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16143e4b5023d9---15082309622.pdfIn PDF document text
    • https://maria-galland.ru/files/file/62259965109.pdfIn 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_off0000afb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB1 13976 bytes
SHA-256: 7fcd19c4c32977c9a15ed2fc4430cf03a7cd0f36caeb85f97d3895f7f04b6814
font_01_sfnt_off0000d20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 10880 bytes
SHA-256: ea812972ee76eedc55953760b9c0c50be7c767d1c328304a5d8bf0dd66444d23