Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f44e85f74c25be…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 16:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: faaf1e166533428da264f77dbbd9a30c SHA-1: 13a52b49f2e08f1ed2efdd0dd64c9027234f7b2d SHA-256: 39f44e85f74c25be28cb81a16401c62a3a872d192164b474640e85dcb751efef
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating it's likely a phishing or trojan delivery mechanism. It functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. These links likely lead to further malicious payloads or phishing pages, consistent with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://hengtongrongshang.com/jingkelun/userfiles/files/20210911221614.pdf In PDF document text
    • http://domgr11.ru/uploads/files/83427310177.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/84e95cde9809aee324b5efb2c5f45c3a/67004922969.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/99443727105.pdfIn PDF document text
    • http://www.grifin.sk/files/53983259948.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613979bd48d90---34458619836.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/67912370997.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/q8sa3gltsckf5vpc94f45fbaj0/vibadadakozufigoves.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/46708431722.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/napavozujixerowuzoma.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613a771a49e63---38974214410.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/jasorura.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/82305174019.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/55251900786.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161378889f3baf---solijamuduzosi.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/9912348631.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/15149930856.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/bozuxefezigakimiz.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/0p3oaba5dsnpi1uccpp7vvb7m1/56402655552.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/48755143797.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/gatukebesinozavuleli.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/83518440989.pdfIn PDF document text
    • https://amgaa.org/temp/files/53308081644.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/rerilase.pdfIn PDF document text
    • http://baove24h.info/upload/files/lezuj.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/faxunabapozebobojuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=data+roaming+android+on+or+offPDF 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_off0000d6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A8 10352 bytes
SHA-256: c53ce5f4e3c02e30410b0c30daae6dcc4be6238db89364f59882967991cb3f12
font_01_sfnt_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 18624 bytes
SHA-256: 63e834eeb49eebd2c27d83f74652b2bc75e482e67267975bcba7b0f53f7b3f08

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