Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae96a220747d540…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 15:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5f2f4cc63bc89b3ccf0e5f7343e75d82 SHA-1: 43a9bb6bca1f9ded5c0e667f329ee614e2b9875b SHA-256: 8ae96a220747d540387289146d3d48bc83356ba1c6b47ca0227f6b79191695b7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which appear to be compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The document's structure and URL patterns indicate it functions as a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=free+printable+five+senses+worksheets PDF link annotation
    • https://partner-support.net/user_data/userfiles/files/vamubek.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/8ls80s1be984c2ve970vuar971/bonefaxizivalodo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f97e191a---gitofugiwifufanefesozat.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/vujozipe.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210726194754_1918232908.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/c80dd8b7b3bf6040c93c67b90f0d3150/80607530020.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/zezada.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/wunesox.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/dewexupumegexutufiwat.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/3aabdde0db8b1fc67713467b7827f423/48421793579.pdfIn PDF document text
    • http://dienmaybaongoc.com/ckfinder/userfiles/files/purevekibababuniguzefuxo.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/likujedorobideketupik.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/g0374hunnibgrf6madcuofcm91/27724891103.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a784d7164---93746681112.pdfIn PDF document text
    • https://aaaxxion.info/images/file/73007823693.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/8a7cda35f1a07352c2c2984bc75b00d6/lesigeniwiz.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/korudipofomunipagobazixa.pdfIn PDF document text
    • http://isvpro.com/custom/files/52767237828.pdfIn PDF document text
    • http://dongfangguohua.com/ckfinder/userfiles/files/4733117335.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/78867918470.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/47296208730.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/989976297.pdfIn PDF document text
    • http://cabini.it/userfiles/files/35260807629.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608656ef8def5---33335159040.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/43925660811.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_off0000db2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 10816 bytes
SHA-256: e2b8338410f5d267ca1dd2630b668f46ee2ad098d67d428c3912559f5164c1cc
font_02_sfnt_off00010bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF1 16828 bytes
SHA-256: 0a4ea9eeae455cf0f959b9c16ebc301c9b0cb429d3ed9650dec425f230d04b6b

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