Malicious PDF — malware analysis report

Static analysis result for SHA-256 718b8001706b1a58…

MALICIOUS

PDF

110.6 KB Created: 2021-09-11 19:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3f167906fd06b9440a229e78021f250c SHA-1: 10c6eb3766226029ee352a8dd27c71940b28d5e4 SHA-256: 718b8001706b1a58634e1fa35f7869b42b1177f1ef1e822bd4612ee295058934
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and contains a lure to execute commands via the clipboard, likely to download and execute a second-stage payload. The presence of multiple URLs hosted on compromised or disposable domains supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://thekitchendesignstudio.org/uploads/files/57452767202.pdf In PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a47e94ecd1---46744513215.pdfIn PDF document text
    • https://onecre.com/images/content/files/gamezafujuvujewojoj.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/sijiwazir.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/pajepitigojuvejidofafawag.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/60147903751.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/jolebiv.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/gozek.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/47007273914.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/02278213613fa2ced29acd8e1a9f3fe2/gewupuvexalorivemumewa.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/51233455793.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132295bce293---jazobivekowolobabexorow.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/fefumabelutupep.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/45160363138.pdfIn PDF document text
    • https://pokereshop.cz/data/file/18581805464.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/23094878671.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/50823105362.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/67d6580135ed613c5d1fada4fd33052f/18566465115.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/16310703102.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/41165053161.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/23228936021.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/nejotobemopexol.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/lerataxakejubok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=download+windows+10+ultimate+64+bit+isoPDF 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_off00014414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14414 20648 bytes
SHA-256: 98f4ce887ea724aa36f1c1985a4daf59913c57683c0e111d234e322f2f930c02
font_01_sfnt_off00017a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000192ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192AE 11056 bytes
SHA-256: 7615fee938f716bb1c3768b4859aa18efc96e5493b9b868ca1aa552a58c44ecc

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