Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8ea061b15f68f2…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 19:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e70fe7c9390d552c612d426bd65ccf24 SHA-1: 9b24b7ea7ea63755e911c3a5dead66ae7839e6e2 SHA-256: aa8ea061b15f68f26a93adb6cc478906b2ead01eca6cb45568434113e2fb799a
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gayaarchi.com/userfiles/file/20210725121522.pdf In PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/89657299141.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/dce309b29f3ffe842780308ee9c2e360/49497603798.pdfIn PDF document text
    • https://faceless.me/userfiles/files/xojupodelukiwuro.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/6157752115.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/37305651938.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080eebbe4571---87223126758.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/55890158670.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/12797627202.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998af10eac3---39256411207.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/55127038982.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/fasunafojadib.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/sodimijakuzasirife.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/epubm69skgb0e6ngg89vmhcdj1/rojoseketabu.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/89186068122.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/dafetatimazixebogibujude.pdfIn PDF document text
    • https://hssanesteban.cl/files/malasonulofano.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/bavomab.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/92a7a76e851e1bce6054252c713855a0/30655433601.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f14d0388b---gakonoletov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ielts+exam+practice+test+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_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 10612 bytes
SHA-256: 0b94ffa67aa2383ec50829dc4725adf368e4e4414c62bc224b09f2aeff5b6958
font_02_sfnt_off00010fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA5 17712 bytes
SHA-256: 5eb35426cf207581a9f4d1f20240502a7c7367f3f22ad91c0a27e0d41d91034b