Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7a37dc0ac2e447…

MALICIOUS

PDF

73.5 KB Created: 2021-09-04 18:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ddfd30992eb129d2d935bf48a264b8ff SHA-1: 42cc7478aed0771915a8f07572cb1617e7a5248d SHA-256: bb7a37dc0ac2e447c1eb2af2fa4212af653cfd16688dd1a184fbd9dc2e06a695
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating it is a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which are linked to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3852

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://crysiq.ru/uplcv?utm_term=pro+css3+layout+techniques+pdf+download PDF link annotation
    • http://huimao.com/upload/11765041454.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/pugox.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/rotiporebenetifotudatop.pdfIn PDF document text
    • https://bmat.mn/uploads/ckfinder/files/rulizegupumimujaxe.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/wimowipafoduwumake.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210802061620.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ce20b4a0a56---18770405809.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/18735374737.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/mafagulojivumujedekidenid.pdfIn PDF document text
    • http://seritour.com/rsm/files/59896077804.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/12088359199.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f95203145279bb1ee87929223c6d3c7d/87829658620.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/rubukurevinapowetawuradu.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecdb334b07---37602409465.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/2718168000.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1c25e4764---76131521128.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/70135021390.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070614355c2c---28354666314.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/8777f250dc6a2b17cb2f4b4cb6dc8545/regiso.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/9412015702.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/lifunupamejasago.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b8cd9d40b---zidamorafasovoj.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befe98ed510---sutamubufivagozakire.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761ed876086---41678720404.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16285460105904.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 11336 bytes
SHA-256: c357872f26b2b53360576865e4daff82272f1c697d6bdd12c9c1d33de2d163bd