Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c84812db5409a2…

MALICIOUS

PDF

113.0 KB Created: 2021-09-07 10:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b0ff2cb6bc1f4724b788e8d52196596 SHA-1: ad2f8eb711db8c837d674cc33546cf90d7fbbbd9 SHA-256: 97c84812db5409a2a2b4b213fac3360dec07f702cf5fad59702d2ddf24a35295
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage and other domains, suggesting an attempt to host malicious files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://fundraisingwebsites.com/clients/9/96/963d931f30a9d2280975e71a7f923c96/File/60021631192.pdf In PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9980dded2---lakapopuvubeteva.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/54219980910.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/tuxifasafe.pdfIn PDF document text
    • http://dmkert.hu/files/file/14744384614.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160da13ac88e62---xowafumenibu.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/831a4e4c81ecc5c7752ab42c057ed0b5/pevizemujofo.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/511572ba2314298a2d2a90dca0891a55/78995641470.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/k63l114erec7jl0bb789u94iuo/51587178781.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/pilejojid.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/sufexavafilatogoketewibe.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/67018795143.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/20363292387.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/58463309715.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/cn52j0vtm7l3kqleudqnglb6d5/ragunetosafevipipof.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/wamelovot.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/go3jbe7k5k84h5fuhmdog1foq7/vogufoxidudajazedifepofa.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/95b0ec8e9ee0a31d2ed4cdfdd8b599c1/depirizov.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/8a5ca164d5eb70b26eb3b5020d1232a1/lalin.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/saragomoteziwezijew.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/64689215628.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms//images/file/45923041005.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/17735001456.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/10499941568.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/fi3e7r846fa88r940r75v2qg22/50105206306.pdfIn PDF document text
    • https://hsse.cl/files/51633050767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=format+standard+operating+procedure+manualPDF 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_off000154f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154F3 10936 bytes
SHA-256: f4f4b47f8b709e913351bd483357ae5fd62465ee44089925ee2ba3cc91f234ec
font_01_sfnt_off00016e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001861f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1861F 18516 bytes
SHA-256: 2f622fb272f324dbb6b4b35c02a60044e8e1d4ede2965083596b47288979897f