Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f59b45b5db9bba…

MALICIOUS

PDF

86.5 KB Created: 2021-09-04 02:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a8c01b7bb45064c54a324846cbf308cb SHA-1: dc18ed7167c86519209b11cfe10c30f1c064e77f SHA-256: e5f59b45b5db9bbac641189e001193ffc26ae242039cd48707e34d8a58006b6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, disguised with a 'job description writing guide' UTM term. While no scripts were directly extracted, the PDF structure and URL patterns suggest an attempt to redirect users to malicious content, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://www.alex-vasilkov.ru/images/wisdom/file/fijewaxo.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8f2uiq6bvoefgl5q3gtqjqf8t3/31262435679.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/70611952513.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/lunataxi.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609424f54b896---96432285773.pdfIn PDF document text
    • http://armanetti.com/images/16659041220.pdfIn PDF document text
    • http://axwelindia.com/uploads/41707318291.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/424nnfnmhpm4ukqdr3fqfpfhe3/90225767013.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7e2b7d6c2---fevikipilaruset.pdfIn PDF document text
    • http://vitrine-prof.com/files/gunazagowalifepenafetuwu.pdfIn PDF document text
    • https://artcer.ru/files/uploads/files/nerasad.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8889a907f---39719428312.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca846953e3---disuf.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e93aa415204739159073905c3f605fab/biderimosegen.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/97482102130.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/scsuaj2h9hs0lajp6njmh57arb/tugejesokebome.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/4jaspvdgotkq9h6338d69d22tt/26591525160.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1623632696.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/pokonexugonefu.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/86245468863.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/j75obdmea5v2eqd863pp9ut5g4/57010825461.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/gimefozawelit.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/67c19a128bbb01bf724fb221cb1f2d20/912372128.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/64015968470.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/69254283813.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/numotebiwiwitevezam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=job+description+writing+guide+pdfPDF 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_off0000eb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB74 18548 bytes
SHA-256: c180c6300f0289837dd15e8fb3c61d85d82cff572d2328fe52c8bb3fe177531a
font_01_sfnt_off00011b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B72 10904 bytes
SHA-256: 463c286e0aaf35be9fc67248e74e3981aab0732afe201cc33aa42616a9059e5a
font_02_sfnt_off00013476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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