Malicious PDF — malware analysis report

Static analysis result for SHA-256 50bff1d1e9583c8d…

MALICIOUS

PDF

89.3 KB Created: 2021-09-03 02:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7c9e3e3c9efe6e726d9fec8209b61a65 SHA-1: 6b58891b48bc9d5512fd95e35ca7bfda5341a72c SHA-256: 50bff1d1e9583c8dfae55d2f44cb32267b10dcaa92ec0a4fc1d4a18193f42c5d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to potentially compromised websites, suggesting a link farm designed to distribute malicious content. Heuristics indicate it's a fake invoice or payment lure, and ClamAV detection confirms its malicious nature as a phishing trojan. The document's structure and URL patterns are consistent with phishing campaigns aiming to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d96b6fd20---nenez.pdf In PDF document text
    • https://stratasphere.online/userfiles/file/zovukenotelusiginemejosi.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/20283617811.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/kebudatibof.pdfIn PDF document text
    • http://houselandia.ru/files/27293317954.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/xetubori.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f1b31407d---xoragefesasifew.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f98120a27c8---35178814493.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090217094473499.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/11242684018.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/tuteliregejizi.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/523d56b492f29f54fc69ae81b1a44ba5/firosa.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/37243444648.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/93902152181.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/vimoniparew.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/nowuli.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/38689537722.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/umiv1s7ol5svo2idndveaqulh5/11742085819.pdfIn PDF document text
    • http://clickvay.com/upload/files/12242545533.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/kerem.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/viriwumikerejagafagavo.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/sogagajidodigosepejagug.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/29471747352.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/woxotevodapabalogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=a+modern+history+of+japan+3rd+edition+pdfPDF 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_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8D 18136 bytes
SHA-256: 06e5c722ef0beb31570c008fd93d479d9134f8faf85e508f57839d7c3dc197d9
font_02_sfnt_off00013dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAE 11112 bytes
SHA-256: 1ef40b490d73852de5a55eb3d55f8cc8738a8c3afb1c981dad14e25a1d8d6df0

Open this report in the interactive analyzer, or submit your own file for analysis.