Malicious PDF — malware analysis report

Static analysis result for SHA-256 7262cb61f172022c…

MALICIOUS

PDF

84.1 KB Created: 2021-08-31 14:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8fccc01ecc5347befd5ade070f569583 SHA-1: 8a0c01bdb0a69ddc83bf82ac6e4beb42ddd3e467 SHA-256: 7262cb61f172022c254f56d998733075e64133d83cad3218c3c2626968a9a21a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://2478.ru/admin/ckfinder/userfiles/files/rejufatevoke.pdf In PDF document text
    • http://wellfoto.cz/pictures/files/90169266866.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/36571639796.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16075efbc966f8---23267096317.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2fd8adcb6---wuperibunot.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609e09eec9450---51587786418.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160afdcc554659---zesob.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/c72aj6k2cv5mph7o0cousgu9c2/romarilivupovu.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/82271610447.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/44903144787.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c7d82c685---9859501030.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/63817645010.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/xumulobowebozigogukut.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/kokovabo.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/8369438967.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/94119758120.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/gm9vdrthh5h4mbep5obov3h47n/texatavanalavubozad.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/fawasozinurisuwivejaneg.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff7018a96a---rumejewamiwupalegujovufen.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a16d50013a---zugarezejubodakexulis.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/noletilirifunabalili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+check+superheat+on+ac+unitPDF 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_off0000e2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 17884 bytes
SHA-256: 68d0231b132584a7e9834f74a5801bad4f5e48dca311eb5b6249c81dc5ab4228
font_02_sfnt_off00012915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12915 10692 bytes
SHA-256: 396a11f56ccf7e0c9a32dc71979ccff332cd6575f15b3a583565a9e8e4e7d053

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