Malicious PDF — malware analysis report

Static analysis result for SHA-256 51493872bd0bf393…

MALICIOUS

PDF

89.8 KB Created: 2021-09-02 06:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ad2240bf7e7099a1c379f34af01c913b SHA-1: 439ed42d9ce17e01caf8e615ed3352e96903c858 SHA-256: 51493872bd0bf3933f774d605b643cd975e5acc39795581ba46341b158c1bdc1
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links to compromised websites, suggesting a phishing or malware distribution scheme. The PDF itself appears to be a link farm, directing users to potentially malicious content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/j7mpbegev5ip0u4in02cbk5h3e/kagudivomifegiwoze.pdf In PDF document text
    • http://ahchala.com/img/file/xigejuwigusinipera.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/xatilesuw.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e31a31cd89---leronelapuvujafedub.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/94168367030.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/elp95bor75gq4j36enkjo3s6jg/67608478975.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a90b5e46d7063768b3fa96e7c4edf590/69105246878.pdfIn PDF document text
    • https://lapakunited.com/contents//files/10960488059.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cee166922---figajilorotaluzixala.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/ana4sat1t863urasvoo9cnrcmk/80464694016.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/bthugvtt5g30309t4s090dbkiu/jikadoz.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/22838596363.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/a3e46bb243f8ecff5eea54b0a7cd8bd9/80080728888.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/8253444018.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a082032fd9---vegiguvusuvuzimipobotugu.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/woladebavozofidudonaper.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/28cc1vpafdfau1ufdg34j31glo/37497905871.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d05b084993---3315132724.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/34407312989.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/kemudifelamozopojidote.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/fuvotabaletizarijore.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210606_F2B6D32F0DD0C57C.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/c8286ba82e3a8b5f2c75ee2244a67f58/dukojukajisurodolugonegaz.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/3783952635.pdfIn PDF document text
    • https://esz.jp/img/editor/files/xutizuzekazeresuxoruko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=worship+songs+for+the+broken+heartedPDF 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_off0000f848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF848 10956 bytes
SHA-256: dbe2fa4822ade0a966cd31301395580c861592d48adc84ba24713dbf31cf24dc
font_01_sfnt_off0001113d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113D 18560 bytes
SHA-256: 96d01bb7c988d1bdf10c1f5508cbca5763251c2ca338d7d1d1ac4c00d1921566
font_02_sfnt_off0001415d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1415D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1