Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b760e1d32942f6c…

MALICIOUS

PDF

70.3 KB Created: 2021-09-07 10:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 906975e213aa84d21ea2794b99fcc8c6 SHA-1: 7282edc81d201ad335cd2dc4e12a410a5cf19f16 SHA-256: 4b760e1d32942f6c0d7e03ef3e1b85eddd3b4d797628cba3740b0ce47810bc19
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ff2400d2540---xiwoxopeg.pdf, are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://novafish.it/userfiles/files/xogolonematalamuwepur.pdf In PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/41453944244.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/pajawexupak.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/56db16f210caffea7acfeb919641715d/jaxolud.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/unkm7f5egdq2edf0bqnhk67do4/janefapurimexixabobid.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c20efc481a2---fuvatag.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c08adf178---67422709637.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/rumebonenesosutij.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/60188237470.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ff2400d2540---xiwoxopeg.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e75404d395fb031a225db9d020ffd219/31635449457.pdfIn PDF document text
    • https://digireg.at/upload/50498169390.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e341761100433bff304f270ecf16fec3/tenimu.pdfIn PDF document text
    • http://ty-int.com/files/files/41089261268.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/91969600127.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/rakirimeseleduzusoxuxuga.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/64161648675.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/3944504315.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/tigiluzinorum.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c2edfa9c26e---78005406389.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/30806395342.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/wobiseju.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/jovufokupare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=phytophthora+infestans+life+cycle+pdfPDF 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_off0000b37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB96 10832 bytes
SHA-256: 5d6d76d6e9d70f62ebbf1b7e47b6571342a90435637a67414b4d5e9c88921307
font_02_sfnt_off0000e48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48B 15168 bytes
SHA-256: 89b5548d95638182042879d235d432e7cb4866392348faecd65ff08cce5edaf1