Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f030cc652043c6f…

MALICIOUS

PDF

86.7 KB Created: 2021-07-25 00:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b9741cce55f34a386ac89a08fde7221 SHA-1: b919729fbd2850cbcc230df81a369bb835685019 SHA-256: 9f030cc652043c6feba5575e33dd6da00770fdc04b12cee6850854d9962148b5
222 Risk Score

Malware Insights

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

This PDF file exhibits multiple indicators of malicious intent, including repeated invisible links designed to lure users to download payloads, and a link farm pointing to compromised CMS uploads. The presence of a 'download button' lure further supports a phishing or malware distribution scheme. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest it's a vehicle for delivering a second-stage malicious payload, likely exploiting a PDF vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • 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
  • 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://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/d11a58c6685205aced87ca366238a4d5/2894056591.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/k1q2tfd63hgffbc6l0oncacttb/gujulomaburefagibusofuje.pdf
    • http://kingcraftviet.com/uploads/ckfinder/files/25871421145.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/avq7s5l5krl67v974j927kbeqv/tokimulosixomava.pdf
    • https://thuaphatlaihanoi.net/uploads/files/lotis.pdf
    • http://teleinwestor.com/userfiles/file/65041654008.pdf
    • https://apskarota.org/userfiles/file/lemedazofofumiwofunonudev.pdf
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/e732eb79458bfac56eed1120d1137cd1/tamotepinajeledere.pdf
    • https://bhsbeacon.com/FCKeditor/file/74585938980.pdf
    • https://srmhospitalities.com/images/bulk_images/files/xoxusagawewafulone.pdf
    • http://animationcoach.com/userfiles/file/mobimewoxod.pdf
    • https://terlickodds.cz/www/www/fckphotos/file/feginikuzevegow.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160706e6d7a74b---3423770790.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160788a80b6572---winupuzurexikitok.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b45a7dffe8---83646287467.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841d4b822a2---90509243732.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb124dfca0---fiwobozedorodedovi.pdf
    • http://csc0851.com/userfiles/file/20210623033216_3bg5ct.pdf
    • http://nfc.soo.jp/file/kodepufetojibesa.pdf
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/gewufar.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=edius+pro+6.5+%28cracked%29+full.serial+key.iso
    • 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_off0000ea5c.bin
fd64eed842e77e55bb08a9fc58eb8c7854a75fc61554502168e2e3d6c64c9145
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5C 17684 bytes
font_01_sfnt_off0001191c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1191C 16792 bytes
font_02_sfnt_off00013133.bin
c1635d939863c3e01bc33c13e00ddf6f44ddb4aaa43960384ea61691a30ca808
pdf-font-stream PDF embedded font (sfnt) at offset 0x13133 11224 bytes