Malicious PDF — malware analysis report

Static analysis result for SHA-256 67336b7306bbeba0…

MALICIOUS

PDF

83.9 KB Created: 2021-07-08 07:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4df81c64bffbc65e5e6edae251c22319 SHA-1: 8ce2b482769c7472f2e128ad5f300c59edec1349 SHA-256: 67336b7306bbeba09b2272476f374fdbb8e3f7695421000ba1468fa6f8eb9817
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. The presence of multiple external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=4+stanza+poem+about+nature PDF link annotation
    • http://bualuang101.com/backoffice/upload/files/solibobezunoxala.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aecf132fbc5---vetomunadir.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160849733114c2---22832855339.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609844e4f1f29---roxegogisudotodifirut.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc7b4479ed---vaviwizu.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ba222394a77---64935670400.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/2a7603fe3269560a80aaf7fbf7661806/pixutelabuxuzew.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/23566809937.pdfIn PDF document text
    • https://eventaipei.com/upload/files/41515823423.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/5soo0jpnk5g8ptaj173krdk2js/zoxekitarimujenusas.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/72819092318.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/9drge0g9op82h1q4nsichp65qf/11616771490.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a0598ab9c---kezokug.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/5nrs91ju4j6r4k0otu0udti8gr/fukuxifigemalufuvekise.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/jk42qhhn1a423he7tqib64e6l0/kuvifigideseminim.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/ak3dmtce1j9t77f329p0btvjck/gekuxew.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/62934068487.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdccd84e073---zupaxunagaxutogi.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d554c43110---zakowaxufagezedagosa.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/miximokaxikemukarexa.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/56864269968.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/kiwipilapo.pdfIn PDF document text
    • https://capecoralliving.com/media/file/88522889324.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16087c70e44e48---zurijapesisusejivoxikego.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087135d47729---jexurotakaga.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_off0000e4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EF 17336 bytes
SHA-256: 71b49a0974c7684fe4ceaec80e10e8aba24af144a44be6047113bd170045393c
font_01_sfnt_off00011262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11262 10556 bytes
SHA-256: d179a8952693346a146cc8feca8d7163f4a20f6f3f678196250a99aae8315545
font_02_sfnt_off00012a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1