Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c916f9bac221e48…

MALICIOUS

PDF

89.0 KB Created: 2021-06-27 05:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7c23386b0750dd3a032f45cf197d8e27 SHA-1: 2a1e3b7f09f263cfdac8fb31329a7c27d2409ab8 SHA-256: 2c916f9bac221e4887058053320a65e30bd86fc30460d5d3ef2052e77fef7ec9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The presence of a 'quiz on cars' UTM term suggests a lure to entice users to click on these links. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest malicious intent, likely leading to a second-stage download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/33e618c82a1c2dc555930b5d361da17f/78445672886.pdf In PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a63bdbeb31f---24199194686.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/72fde9395486cf31ffac6f5e5ebab755/4766264929.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d88f4e19a0---8421995632.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24ae8ba4b2---11602002945.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/sarowunekuv.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/nufube.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b58e84739---malipogapuzekami.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160834162a5376---doxivuwufuvolusexo.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/80661239398.pdfIn PDF document text
    • http://coffee33.ru/archive/file/52150562384.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/74p6b93gkbthi1m2jmfhlc8vs3/peradobawobagoxetotafe.pdfIn PDF document text
    • http://healthywithhart.com/res/file/71734178595.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/wojevujivatobewif.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/4ff2348d51fe2ee14bf8c51eb9591124/33485998853.pdfIn PDF document text
    • http://dgjst.com/upfile/file/51782663768.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8007d95b7---wilogexulifofevak.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/83690091903.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/vfk0tgvft6ud3cn1nhelbel023/vupipe.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/aaff6b0725fdf62a674170918fa83253/pufujodukuriluki.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d28a859faf31cf3e65ec446d4a5152b9/wekusegub.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608646c00ff18---1624253858.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/9ff6627c73a9d740389d7afc7c2655a3/81726583974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=quiz+on+cars+with+answersPDF 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_off0000f79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 18124 bytes
SHA-256: f00edfbf6bd855cdd545311737b2aa835214b24ccc02142475e0a201ca818c7c
font_01_sfnt_off0001264a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E61 10588 bytes
SHA-256: 50f7a92c3c6e528a5ed683ad75490306218ae109276b418f5a1beb0565662052

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