Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53e01c2fcfdf7ef…

MALICIOUS

PDF

77.4 KB Created: 2021-09-15 09:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9dc09ee678bf51d20278e6c06b444ef5 SHA-1: ddd75df19e63da8294d4780ac9e7c6a1d6c24ee3 SHA-256: d53e01c2fcfdf7ef5889c23455a125196070b3f40515364d5f0b9c72db161cef
204 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous links, many pointing to compromised WordPress sites, and includes a lure for MFA or one-time code harvesting. The presence of external URIs and the overall structure suggest it's designed to trick users into downloading a second-stage payload, likely by exploiting a vulnerability or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=twrp+recovery+apk+no+root PDF link annotation
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/e00c92c187306c93c4925939084fe341/86551908128.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/23358077215.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/tepumexiwajeminep.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/dakupu.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/88210195552.pdfIn PDF document text
    • https://ms02bet.com/contents/files/jefozivovilod.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/kunasavimoporanefadadami.pdfIn PDF document text
    • http://24cvety.ru/upload/files/72075432023.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/95810223064.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/jowekuxuginalekogotu.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/282vj8sj7fcmfc466fdessj25l/65571209830.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/43343129457.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/b71db2a7d00192a1bbcf149b835e33cf/14195708266.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/94914889278.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ad8da52dfa6a9aba0d426a050d44e88b/55763100366.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/77112276917.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109032352195340.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/segoberoriwa.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/44262316882.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/denosofimizek.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/3068129695.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/95798596951.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/77488780530.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_off0000cb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB35 17236 bytes
SHA-256: f8fb959519c12ead33a68e53803253fdfa9b79a36ae6e4bfd57572583c2afd7f
font_01_sfnt_off0000f7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF3 10380 bytes
SHA-256: 25f337cdd2c293b110c063f09f9f1916120aa7719fd7f234289ebc568db23b12

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