Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77266f2451e87a4…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 21:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f3c5b27f11af3b2e0d0ce3c0e788426e SHA-1: 9b1e848b2b742004fc95f693b963d3671497162a SHA-256: e77266f2451e87a437f29ee683d9e3884183b5e21cfcf4caef634328345208ad
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://gestionarival.com/userfiles/file/kizibimatanesoxukulupufut.pdf In PDF document text
    • http://flexa.cz/docs/file/4645801194.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/zamebubunuva.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109061529296476.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/mepobafekefa.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/fumagusefetuba.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/1j4fplv0eccfjbl224ca6ulaaj/61955138518.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/lukiwejijipa.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/tidujuvifuladavijigepo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d78f2aeb42---sipinagefezogotemevadake.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/gagizutop.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/seberosesuduzukamaki.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/xaninusuzopineb.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/8f96de6d3b68aaeaf89a51ad1d8e2df2/lobifajab.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/fakoxomewejikadiwepaful.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/dodefujenosodubaguvasokum.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/59031146991.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/wenisubibugidik.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/74156727238.pdfIn PDF document text
    • http://moneymaker-gold.de/files/20954244268.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/wumirobimepegisezoma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=live+football+streaming+app+for+windowsPDF 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_off0000dd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8F 11092 bytes
SHA-256: 6944abe34e7b432bac45cce88b3074d0a500bf22ee9f59cce8c378ff23bfca72
font_01_sfnt_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 17476 bytes
SHA-256: f398199759f295f7b1ee4ffd3d11b06f546f8d686a1e64106c896738cf6e1cbd
font_02_sfnt_off00012464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1