Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec5923970aae401…

MALICIOUS

PDF

76.2 KB Created: 2021-09-15 17:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 432b6b525e864e89e69e74ffaac6c628 SHA-1: 41548347e7abafa17d6e25aa03b87d143f27ab35 SHA-256: bec5923970aae4017455a6d76465757516998019512424a64d1d0c82ea4e4674
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the structure suggests it's intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6541

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 https://synerhu.ru/uplcv?utm_term=fmf+mod+apk PDF link annotation
    • https://branchennachweis.eu/userfiles/file/48826573105.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/5b0d127f185af07320bb822bc92983e3/fakid.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/61529873933.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/judume.pdfIn PDF document text
    • https://nasikampung.info/contents/files/18158092044.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/32502442744.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/vaxapokawabed.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/giwuzibapizunilawotip.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/sewapukodekopeduseme.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/zanupikabakaxijusup.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a728b9ed8---lazuvuxenelawuto.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/7f8b3c9de3443fe2f1f1574edac1f355/zamoninikeg.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/bifezeseleriz.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/3891527152.pdfIn PDF document text
    • https://almavilag.hu/files/files/27038074044.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/63402941562.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1614036793d313---gobizevalagusesatep.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/5660237091.pdfIn PDF document text
    • https://flomogroup.com/upload/files/puxukozemidudobipujes.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/vomatim.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20219121656442538.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/jogekidekuwevizaji.pdfIn PDF document text
    • http://strap.sk/uploads/file/mowotavikifebikijevuromu.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_off0000d46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46D 9988 bytes
SHA-256: d7708a68fbf75bc8cabb5002318181356a7d4de0f57afc215ff823235172b81b
font_01_sfnt_off0000ea7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7C 17548 bytes
SHA-256: 70cb43be021d7c5f9140d063eb2d8850b97a4a99b143cff3174ff0e572d9f1a9
font_02_sfnt_off00011754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1