Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9ded209bbf4e4a…

MALICIOUS

PDF

92.4 KB Created: 2021-07-31 19:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ab001780cc3885b61d7f4a4b9ed9fa31 SHA-1: aee10ebc15d2488eb2770c887ae4b04629f01267 SHA-256: 7c9ded209bbf4e4aae65a70a10745284d5483eeacc9bb050d4636d3dcd935aaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to distributing further malware or directing users to malicious sites. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/patunaketemu.pdf In PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/149002316f4e8d8ca42b4de774e33a4d/gadavijapa.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ca78023ef---14769826156.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/44ff80e1cbc956f57d81bd684770b15e/43119229697.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f55183bdc91a68ee3a99f077b575d42f/bamurowumitiponesu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b1c22e4d---livuxipininuxaxap.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/51602830386.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/matofuloresaserowik.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6cd1e1a42---84226781230.pdfIn PDF document text
    • http://etre-belle.su/images/file/27948065801.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/72ca2a040e68b66dcc9a20bc21ff4004/wuxolijasapetimonadeduxe.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/felesowasavob.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/6f3ad99e19281b2508c9337859321f8a/16514524288.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/3642230250.pdfIn PDF document text
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/22481778790.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa661a0ce4---40403181465.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086edf15a579---99807289564.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a71705458c0---71691290191.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847145a4c85---7888456470.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/zewewimezezumemexovawipor.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99524306351.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/vizatam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=top+eleven+2021+apk+para+hilesi+android+oyun+clubPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE9 19108 bytes
SHA-256: 66be5bac47770ca58264059cf579530752d9b48e22f766baa73c0a38794c79aa
font_01_sfnt_off000119e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E3 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off00012f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F29 11280 bytes
SHA-256: c7ab48118d5f27a8caf5961116ed9ad58964f101868a7882d2c7f64e15259bdd
font_03_sfnt_off0001497a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1497A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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