Malicious PDF — malware analysis report

Static analysis result for SHA-256 1537a91697b5ccd0…

MALICIOUS

PDF

84.4 KB Created: 2021-07-30 14:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 25fc7b81f00d446b64fffb850315b091 SHA-1: 3ed0fb59eeed931a86d8e3283a848e9143d49f98 SHA-256: 1537a91697b5ccd0b2152681c8f0da1eb83decbb33a4a50dd41b33c083c1e757
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the link farm indicate a deliberate effort to redirect victims to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://wastran.ru/uplcv?utm_term=monster+inc+2+pelicula+completa+en+espa%C3%B1ol+latino+facebook PDF link annotation
    • https://bor-diing.com/upload/files/ninivurul.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d192b30c34---jubatasazegegorulidum.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/9uc5f5rut7o4m516lv6nkehj46/lelafimizejifo.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/92640700823.pdfIn PDF document text
    • http://ttc-investco.com/img/files/xanubasomemalev.pdfIn PDF document text
    • http://saens-jpn.com/ckfinder/userfiles/files/67157356803.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/sereretexedinezosok.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/ba102d46c262a9ebc19dae0f5ee7174e/6122779578.pdfIn PDF document text
    • http://riversedgefm.com/files/file/munokawupavur.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/36702854700.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/39hmqm05v3ob91t8b24psmn9h1/17385881948.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/896a724303a02601f362548485feb0a8/97836756060.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/xovimitotufodukuzidotejip.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/2beb78c06355ea7d61d456b519434d0b/bewolaluvavurixi.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe5bb7c5cec---86663089908.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160726b7d1ab88---30954381205.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/11092750655.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858ab07111a---84271595796.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/xizinum.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/d67c7b2ec29b29b86a477184e5c77ae4/71423771441.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/6d7ae58aefb573182dd4ebd7248c2f26/17016720420.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/69641ecd7d77ca8281d612c674059eb3/46937886828.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608be2db8b29a---91282712577.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/s1udhubfgkpiel89ae3a727s47/35945935287.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_off0000df29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 17496 bytes
SHA-256: 5b6034375334151a2f6330564b9f77aa428f810290de3a52bdaf631b4b43b02a
font_02_sfnt_off00012552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12552 11292 bytes
SHA-256: 4d162dc1647ef170e9eb5c9130b7ddfb175ca040bf28cf2fc8cb596ed261b888