Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6bafb022193f2d…

MALICIOUS

PDF

81.4 KB Created: 2021-08-29 20:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d4477e6d84b1ed84e80e196d8a4ef690 SHA-1: 663a6f17d536521fefb6c6d9fa6a9fa02793cf0c SHA-256: bc6bafb022193f2d74fcc36dce6895f926aaf52f8b87f572d25ebb6fb5ae1937
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised or disposable domains. This structure is indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7642

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
  • 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 http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/1801663f7d31b24df42b59c3845fb5ed/vobelinavujijoxipami.pdf In PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/19e58ec0bc95cc7ae8ccb452882044e1/91676327399.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/nagozidiwijojan.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/26192141818.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/25464488405.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/930d3e74291f02b8062029d32367a9f8/kuvelerefalabu.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/54382221943.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/43457297981.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/0b2f3d7dbe3e2ca0bc06c0d10f6e814a/30059941804.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161005a692af74---12973776037.pdfIn PDF document text
    • https://kham.vn/userfiles/file/17001378317.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429124424697353.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/fodibavorufikiwomogotudaz.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/posijajusiwe.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/woxir.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/zemuxumudoruzujolesilaxag.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/rvfj17009k4m3dpggaqd1n0kdg/16897458393.pdfIn PDF document text
    • http://texmet.pl/userimages/file/jetasuputisisod.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/7844740423.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/69d1797349fc2b02cf401c6a96907604/ganoloxofosagovi.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/jogul.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7936d202b---49222246545.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a1e0180d8---telot.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/40027657985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=can+you+sand+and+stain+bamboo+flooringPDF link annotation
    • 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_off0000e3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 10952 bytes
SHA-256: 9ee9fbca520d5163240eca51ed8ef4006468fae3495a4a1de6b8784165726362
font_02_sfnt_off0001153d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153D 17836 bytes
SHA-256: 57e62baa24e92396eafc4921fde92c81f20f5686783c06a8c0d3aca5e7547cac