Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9e1b943bbf65d1…

MALICIOUS

PDF

87.8 KB Created: 2021-09-08 04:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a32775120da4d690793dbb0b8dc4629b SHA-1: a0c7b2ddb6589a93528c314bfb69ad0967a80192 SHA-256: fd9e1b943bbf65d1f8bb7e04bc107fb4b53f86a1dfcc539b37ed31688a36d0b4
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites and domains associated with link farms, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=pdf+voice+reading+app+for+android PDF link annotation
    • https://zzwgjx.com/d/files/sofevopasunajoxuroj.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341a4000899---manitofutave.pdfIn PDF document text
    • https://chp-travel.ir/data/file/sexoduj.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1610d989f493db---71823550006.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/2217729533.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcb7efef97d---lisatojo.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf04c9ec80---pofaxetekanogo.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/velafovavifekew.pdfIn PDF document text
    • http://keramann.ru/uploads/files/jutalirer.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/bexonumubuketurovurexamuj.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/lasixelasegifusagasefupot.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/47798965516.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/45b633c83f78b562f93adb18310a697e/witedo.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a768a27143c---sumereluvemajilul.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9859a4c04f---sigonolagik.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/vosunuwazo.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/kemagisigugazukoxapasi.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825e3b53773---tuvokafakepazubotidebazup.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/lawefimenexerolusonez.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/dosobo.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/ruzitajini.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/81075079170.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/53605498298.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/kanolixasiv.pdfIn PDF document text
    • 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_off0000f18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 10548 bytes
SHA-256: 1c82c1dd03e8ca03716d636f680c2c450d4233a71ddb729fdd36ce3dd1b39b4c
font_01_sfnt_off0001097e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097E 18640 bytes
SHA-256: 8976515b94e6519dd1cefefec3f3ffc88575c323fe1f6ebf79a8e98cc72620ff
font_02_sfnt_off00013951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1