Malicious PDF — malware analysis report

Static analysis result for SHA-256 73272d36ef6e6f46…

MALICIOUS

PDF

80.0 KB Created: 2021-10-05 07:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 839803481350d34856a36cb8de0f18d8 SHA-1: 28d19b1644495d0104d4d0d0681330444cb621ac SHA-256: 73272d36ef6e6f46f4da81fadb937277b0271a590c847b97ebe80dff476da9f6
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to direct users to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2676

Heuristics 5

  • 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
  • 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://webinaris.biz/ckfinder/userfiles/publics/files/33132634065.pdf In PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/nuzatega.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/tevemukogisuju.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/32051492502.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/tagabisesepixogufu.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/gudizutefim.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/98684952145.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/nufajivawulivebekal.pdfIn PDF document text
    • http://zmz72.ru/files/file/karepasanufumuk.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/gedipifaluzuwelemil.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16148d70bf0a1a---rogoxavetad.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/56044991976.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146dee125904---mivanat.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/79800140716.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/lemuruvuzirejogebijas.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/nigorireluxatelolav.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/948ffc86f704a215abab06def1d926b2/44979464793.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210915/files/20210915162520.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/bikojakujarazisumoxiza.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/62947073966.pdfIn PDF document text
    • http://hybsch.it/upload/file/zobomifufin.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/95455348759.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/78610900219.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/47000175484.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1615a5060a4132---6261253393.pdfIn PDF document text
    • http://airsoft1.ro/files/file/80130194866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=glencoe+physical+science+chapter+17+review+answersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF3 10880 bytes
SHA-256: 144a91034f7e3e225516ab11d043ea1743188096a50c788874513343e5865ed1