Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5472a2ad61d3b5…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 22:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5e557ee49c5032280ca27f6fe321454b SHA-1: b6f5d896702c4786d2c811ef266ff24a73454cf0 SHA-256: 4c5472a2ad61d3b57180587013c35ea3abaf0fa5aacb25731bfab81a512edc23
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the attack pattern of luring users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/4279deabccf6e4c3fdffaace47af64cf/82032159977.pdf In PDF document text
    • http://anipetkingdom.com/webroot/img/files/bezodibetixiwupu.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/sorazadewabudiwugen.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c06ee3dbcea---mekokovapawes.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/sibabuzipiro.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/setazuluvoxukomek.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090382b1d157---89535905751.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/nopupupepuwagupibabeta.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/b28htpqehrchdu9vturarqe7n1/sinusidofasadorokodivopok.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c58078d5c---5079841203.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/e036015eef1f0eb9569952ffb90fc21a/31941622309.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087df17dbd31---jeneburenorifo.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fefeeb4cdd---36258352054.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160731f01069f4---4168581286.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c114c0841f4---jafomozopatokubirimez.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160708a46ace6c---vagudumizigo.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/sebonetid.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/46001187460.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/refikebil.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/18409666369.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/vumebozefemobuwaru.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/zijotukugilev.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/90541213023.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/41c85cd0c668b4458a04678cabb5363d/dekopabivavig.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/57fa673a09cc102f3e6b4453569497b8/mosafetesijixaxuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=action+plan+template+powerpointPDF 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_off0000eb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10347 17228 bytes
SHA-256: 6623b257712671a8bc911a93957339a478c352e3dbe5576e3b0e73e73d046339
font_02_sfnt_off00012fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE2 10432 bytes
SHA-256: f48d587ccb4dfc442778d7b8a899c2610d07cf5fa013ce2a531937d959a0661e