Malicious PDF — malware analysis report

Static analysis result for SHA-256 389ba87677334385…

MALICIOUS

PDF

79.8 KB Created: 2021-09-02 19:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a6d8213e45b1a4d2a338ab87b95e8e12 SHA-1: 736e95dc1f6ec45f5a47ba70175c9abbc7dda2a0 SHA-256: 389ba8767733438550f0de6c9ce343988022c401395c355c5764a4f7033ae13b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document features a large number of external links, many hosted on compromised WordPress sites, suggesting a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://coretry.ru/uplcv?utm_term=prestige+pressure+cooker+manual PDF link annotation
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/pirox.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/u9rdr96nqm42v4mk3bcuhtiopd/46234941930.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/fc31c4fe49ca7ee1e5bfd13429023b63/66274952768.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/xubaxawaxarik.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084e26c132f6---molukefenotomefokirobepud.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/vasupeguxurevuvu.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/86586780284.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210902105613279.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/10f745997554fbb1dc956d03925d28c6/82570407274.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/cea398725e2a07f5301b552b7e6d46ea/90118762976.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f07069666---pebevepijubibedip.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/jowikokon.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aedc8829b---37982434427.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/mesirozodagetofogifof.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/dekezetevusazagona.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/27598997332.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/8083r1jtfl4mom2tkjo2l79ifv/konibuzifudowevaf.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/15790924859.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f074179e18---polalisi.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093233dbaf11---53747858731.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/43847620949.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/disebolatinilewata.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/66536991884.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef75b85f3d---81938135426.pdfIn PDF document text
    • 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_off0000d203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD203 10912 bytes
SHA-256: 3b7c8302cb49fe73beceaa67ec578c5ac5622ff06edf3871f99c1c6969f07a61
font_01_sfnt_off0000eb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4D 17860 bytes
SHA-256: 32e7f0f7ca86adb8932522ef6869cc67b704b8f1f835946188cda93bd4bfc2e0
font_02_sfnt_off0001190b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1