Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1e5302d18b86c1…

MALICIOUS

PDF

83.8 KB Created: 2021-07-22 05:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e22bcb44aceea5b8f7c972de14fdd9bc SHA-1: df0b0fa909e3573e0379ac3be8bceac03ce8be22 SHA-256: ef1e5302d18b86c15bd4d99e707f4f98b15f63e403a8473352acc4c8dcc709fa
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous unknown URLs, many of which are hosted on disposable domains or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://simplehome.ro/ckfinder/userfiles/files/julemutopixijejomukula.pdf In PDF document text
    • http://guoyangmoju.com/userfiles/files/61462361487.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8325e6408a---39991869806.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/93766524853.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/sisivemogatu.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/76176301140.pdfIn PDF document text
    • https://mmszke.hu/files/file/wujune.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc592387b1---zesazubunafuw.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/burasubivap.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/ditotapinokijavasoreguja.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaefa7ac99---raxudekiw.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0358d890c---92466494568.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/83d86ba202c062a7bb153a1057a5a329/jadetev.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/91247983698.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c09e1607c5c---binefixibik.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/82667021159.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0544a4ffe---vazevusas.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/43768122335.pdfIn PDF document text
    • http://dgjst.com/upfile/file/96665534813.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a26d932cdb---81415961708.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/a218217658bfbdf9468bc09c1e939efa/88966633676.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/32e6e68586b491d83c1b0fbd86b7a3bc/jinoxudetagi.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/mexugiwuki.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/58986752267.pdfIn PDF document text
    • http://atek-ent.com/upload/file/pebaki.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/17781876196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+implied+contractPDF 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_off0000e34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 17844 bytes
SHA-256: 48566ebd618f710f31e17e7da0516e4096ed5f5cd3725e8cff34f4b74e87c3f1
font_01_sfnt_off0001116b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116B 10772 bytes
SHA-256: b6d2a3083fe98cbf2d9109544a6dab8766ee5a6bb7cd7ea459a6aa3b1dacc420
font_02_sfnt_off00012a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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