Malicious PDF — malware analysis report

Static analysis result for SHA-256 26112feb5ac1de1c…

MALICIOUS

PDF

69.4 KB Created: 2021-10-02 12:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0144f09536aa67f70c7cf98b1b2fadbd SHA-1: 5c8603a2d6b4be47703b48aa7ab8d878bfd4c058 SHA-256: 26112feb5ac1de1c4fdf42c91b0d80e02675610e170d94e58c10af2f238914b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, including links to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external resources. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful sites.

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 http://ttc-investco.com/img/files/34985779516.pdf In PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/79009179885.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109110446188478.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/bexekitotula.pdfIn PDF document text
    • https://flomogroup.com/upload/files/20905201089.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1866715e8---givakusuzub.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/suxurotozojemepimuresa.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/bajefeduki.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/wejiwef.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/lebaxud.pdfIn PDF document text
    • http://www.moyekolodin.com/files/kukotonugaloxukefitavo.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/xilusonowepufupesenijeda.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3c8c3eaf6---86501223192.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/63510073527.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/12483470708.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/63193275935.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/vobenup.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/88999697246.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/fifeveji.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/85959485525.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/xejidefabonix.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/91374059823.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6e5117652---37174718888.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/gowekibonobabirefofobomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cookie+clicker+legacy+upgradesPDF 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_off0000af5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC770 15552 bytes
SHA-256: 8589b3c300370067eb96d98729fd1d2e2a25cbcba50ce8a995d13aed066f5a03
font_02_sfnt_off0000ef5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 10824 bytes
SHA-256: 2de3cdcdaa7fc5c5c77b3f61ceb3b5cccb9666b0abeb982091b0034aeeb0a628