Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1e627c11f23d1b…

MALICIOUS

PDF

78.5 KB Created: 2021-08-11 20:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3d051b4a67395fc3129cf122010156d SHA-1: 2e509ed7e1ebf4d4c5d2b1318537e1639afe329e SHA-256: 5b1e627c11f23d1bbd84155b8c4413d821cc9eacb40fa18e231a0e2ccff697f4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters further support the classification as a link farm, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://solar-makernavi.com/ckfinder/userfiles/files/vemukikixafuvulupoxini.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/b35489a0a878f48bfa048e395afd46cc/52406533559.pdf
    • http://rlmlaw.com/images/edit_images/file/levebabewozikiwawiluri.pdf
    • http://indovinandoilmondo.it/themes/userfiles//files/mumisogixapiwetubabadag.pdf
    • http://ficfart.org/userfiles/file/24531843319.pdf
    • https://delphin-restaurant.com/ckfinder/upload/files/gozinuvulo.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeb06b860c---xelepewemijowifexedurogom.pdf
    • http://inlygiaylynhua.com/upload/files/butazafarotazebuvusirug.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be407ac6ff---70906307169.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa658785368---13363434125.pdf
    • http://haenuri.net/ckupload/files/14734386017.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/1202ab6a8a847c7fcf1040b0aeec075e/88672998182.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2b1587828---74741897865.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/galunabepojewigagan.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d29a5c785c---73567462061.pdf
    • https://777mto.com/contents//files/katavogiwikerap.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ae60b64acef5ee420582721fe1dfa80e/22258779189.pdf
    • http://trungtinjsc.vn/upload/FCK/file/vujomodigekevujidodimofa.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/8f4e634894fdb50a826d77d35aedf05b/rozel.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a32afe931bf---kuwew.pdf
    • http://geyikkimya.com/userfiles/upload/file/91558933021.pdf
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/mutekidizexuzolazajedome.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/dutalowolelolaxitosekiwo.pdf
    • http://ahkjt.com/upfile/file/julexojewegonokawul.pdf
    • https://aartipalette.com/userfiles/file/82372193681.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cengiz+han+mongol+filmi+izle
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5c6.bin
b8c8e9a4d52af99594385ae29d6f3b798552b2f058753f98ccacf14e446cdaf8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C6 22312 bytes
font_01_sfnt_off0000fbe3.bin
7f983510ea713856f23affba516623fc66c17a2564682cb0fb6a38b778672ffc
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 10388 bytes
font_02_sfnt_off00011339.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11339 16792 bytes