Malicious PDF — malware analysis report

Static analysis result for SHA-256 670467d89eb7a00d…

MALICIOUS

PDF

90.3 KB Created: 2021-06-27 20:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 621746c42b2cbc39efdd27d9226e8c91 SHA-1: fd55607cfe1360095804cbe1d24b859a61d37b24 SHA-256: 670467d89eb7a00d993fd51daef4232b5adae51cc567f71656825d756c641b89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it contains a link farm pointing to compromised WordPress upload storage, suggesting it's designed to host and distribute malicious files. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160910ca0c3be2---zijabuvilawubujozip.pdf
    • http://www.flamanville-76.fr/upload/file/wiwubom.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a177f65f69---dazotab.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/2df25d332de253e51f9cdb6a205595bb/vuduxikegopoko.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/9cd033c9c9e18d5d7a36ec79de039267/buzowelutoxafono.pdf
    • http://htwy.com/upload/file/tiderifopuxajoxod.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/l8n29d63sgtthrvt5tvkffv3rp/jesisosalurelavepakasodej.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842ff78c31a---26335054548.pdf
    • http://wu-pao.com/upfiles/editor/files/66092269144.pdf
    • http://zae.me/datafiles/file/safuzejivudafe.pdf
    • http://czdashan.cn/uploadfile/file/2021042821592273499.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/ac651c223827a07e5acdd605e325b418/kibidegoveg.pdf
    • https://jerseyshorepirates.com/userfiles/files/92120009430.pdf
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/mubofonutivorebax.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/7b6af5f3ea2307a905c96118592ba327/14087109394.pdf
    • https://www.carrentchiengmai.com/files/gumekoneganal.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/hkqr5httbkjuu9j8eqcevuf0nn/niwojamususo.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f13ae7dd67---tuvamatazoti.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f04667594---19694596961.pdf
    • https://gangnampools.com/contents//files/28813918371.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/38aafad30e91e4bd6f5353220fe5abf5/89601267440.pdf
    • http://mwflower.com/upimagesfile///77704458138.pdf
    • http://salukool.ee/upload/userfiles/file/31671828183.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d63f7a8c1---20831827943.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c0ff1f36f---zotobagiwevetigigikuj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=printable+march+madness+bracket
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 16792 bytes
font_01_sfnt_off00010ff0.bin
e65760282a0f4d0e4f24cfec20f024809740f4754fd08c7b17ca83b203c22b1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF0 19648 bytes
font_02_sfnt_off0001437c.bin
f4723b5e76208c650fc99933a3b57ddad42cc08be9b43d3a7a417c7e69d2ff9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1437C 10748 bytes