Malicious PDF — malware analysis report

Static analysis result for SHA-256 c650d5bd0f0c3953…

MALICIOUS

PDF

84.7 KB Created: 2021-10-09 16:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2345cb934b0698be911268b239359ea0 SHA-1: c18f260552c3dfd43b331f8f0a4af08a86f851bf SHA-256: c650d5bd0f0c3953b53afc8de647da37b364bdb31340c236534bf9a9858e5c62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as link farms on disposable or potentially compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://eau-msu.ru/ckfinder/userfiles/files/jexiridawaweva.pdf In PDF document text
    • https://a-metal.e-giant.net/archive/file/files/jenuferizavijanetidudi.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/nerabelifaxaputuritikiwun.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615bda915c84c---matufepejobivemupo.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202110040736596667.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/46847583420.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/mafupome.pdfIn PDF document text
    • http://ranczowdolinie.com/files/97986790776.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/67107114352.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/duzidefal.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/93891321840.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/90717397710.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/qepl1j8i3312dhmcb0vds6b252/jizos.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/80109769583.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/lelijuxuwutovadipeko.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/89074201622.pdfIn PDF document text
    • http://diepdoanhmetals.com/media/ftp/file/26622573476.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16156acbb53da9---918804581.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/89988730509.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/4180114129.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/tutugupugamix.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/21461523929.pdfIn PDF document text
    • https://jin-ji.com/upload/files/58401862489.pdfIn PDF document text
    • http://atomleasing.ru/media/File/8595959626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=will+you+come+and+follow+me+hymn+lyricsPDF 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_off0000e173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE173 10936 bytes
SHA-256: b1be09cc7a34714218723e576d17de6764dae1d23c367b8a87292b72d850af2b
font_01_sfnt_off0000faa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA1 19388 bytes
SHA-256: c3f4ea9ffa296b3155ebbe654cc6eaa134ccb2af7e47d691c63da7eb6bb9647c
font_02_sfnt_off00012d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1