Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7de4b25ed6defa2…

MALICIOUS

PDF

88.2 KB Created: 2021-06-28 13:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08f25a9af61e3de944502fe6c9c9c623 SHA-1: 4683ec108bfdd14034d109a74adeca2343a8c05f SHA-256: c7de4b25ed6defa2ab13493542c853a2d0cad6b2018532b7825d5cca05aafd1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://darec.sk/files/files/kusal.pdf In PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1e81d6a6e---xesiju.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/173377d08f629c227f73f58c421e89e3/32924724894.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d5016e0e0---fenomekosajipod.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96b4c4b66e---tuzupigo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160805d7ccaf20---7566337722.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tilawutegoxiwijunutofi.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/vtv776cc78ro36qc5d7b946sc0/fulojigawuponibadol.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2ee83d4ae---juvite.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b99dbb354---zufun.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/088ef18cc562cb671e6047f074b13162/foremoxeresa.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/zuwiwatifupibafola.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/vojoduneg.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/13625675666.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/160809ffd84ada---75711907433.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a4806a67adf6d164d7cbeca377e20754/fixabakal.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/6q7o9osb2hdauagdiun108bmc3/6394891213.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210510105523_1312173546.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/15875707044.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/561b254fc37059096f016181555fadc5/2699352946.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/23865252413.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/gebibugofifade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=normal+form+spermPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/82981989587.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_off0000f951.bin
b726757063170ef1da37fcd76f6479ce2325c40f2d1316d3e2313e662e2a6c63
pdf-font-stream PDF embedded font (sfnt) at offset 0xF951 10204 bytes
font_01_sfnt_off0001103a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1103A 16792 bytes
font_02_sfnt_off0001284c.bin
daa5beca96797e9f1532573b89b669e456fb67f140fe226a32e8cd5d637be04d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1284C 16756 bytes