Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd6ea59b47defe5…

MALICIOUS

PDF

104.3 KB Created: 2021-07-31 11:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8f7255f60fa1054e8a6fc18e241d94f5 SHA-1: 6a73dab5544ba43908261b9bf26861e5db537f8f SHA-256: bdd6ea59b47defe53086729610dcac262ee09a58b9779248aa789834921e9701
204 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a link farm on compromised CMS uploads and a lure for a password-protected archive. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The embedded URLs point to potential download locations for further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://skyzoan.com/cake/beta/userfiles/file/gakozesowotoxusumefekimi.pdf In PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d03b00ca3f---28799913454.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/77150272221.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/perod.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/2979424957.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/29c0a1762acfc0409580534ed14843b1/wurujefo.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16100a7d36064b---53564768470.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c3c3b83a7---butafodofedofegoteso.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7cd3151254---gazurefirajar.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/2hmat80k05hoc4fm50ep2rlq46/lexilavurafidu.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4c7674f8c---givojilomifozarajakogujuf.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/bajusevar.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/55473590567.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/55986342886.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/f49a7c3e2801c651d38ead9b46c2184d/tefubedisa.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aab792bd172---mezebebawanemezaba.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/7bce9c73002017e71478f2408175a290/45927783026.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796fa69299f---fevivibakafifizupi.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/kaxibakasewimikuxedofuje.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e43a24470f---tawojiwavufusikonire.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/55defok3qm1ac89trt3cib68ug/5989250582.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/74448050894.pdfIn PDF document text
    • https://arerp.kr/data/file///83954851255.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/53e566353bd032887826e6412c272079/89161980765.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/69086083758.pdfIn PDF document text
    • http://yalciniskele.com/imgup/file/samudeledupigudaxagopor.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/99684361507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=goodgame+empire+hack+gameplayPDF 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_off00013239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4B 17916 bytes
SHA-256: cb9ef33a1129294aacfff3a4ef6c88e101f0e85139d3ab44244e0ef0b7316e14
font_02_sfnt_off00017929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17929 10836 bytes
SHA-256: 5572fc2957d67f7813ccf48831e586d03e363d909948f887b9cacb8cebb14cc8

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