Malicious PDF — malware analysis report

Static analysis result for SHA-256 799da255c275b516…

MALICIOUS

PDF

84.4 KB Created: 2021-07-18 03:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ef0f8cd426f15ca68442d39289a582ce SHA-1: 4a22863b250347d8a101530b69f851ee8b3a158f SHA-256: 799da255c275b516611011869a73c27e6d6342a7d565761b6a1c806b3b7de4e8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were extracted, the structure and URL patterns point towards an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://dusunceokulu.net/resimler/files/45880718578.pdf In PDF document text
    • http://agiusfuneraldirectors.com/files/file/780336933.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb01e7ac519a2b2bce9cd83ba0bd6e21/wivezipafojir.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/pupowibememetozatusalos.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/cff471353432fd4acd97711607f20c65/girogalewelufazubazideb.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/fujotuduzusijekiri.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160761344dba49---gifuxewi.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/a267c05bbd088895ed20b903ff1213f4/sixidufiwa.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kawaxujufatexaz.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/gibinuwiwuf.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/amttqo5lgn7jolageugsucbiua/wewufijupajiza.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/xaraxilekobalakote.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/vakovulesisirunabodaw.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/1493525018.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/39372643262.pdfIn PDF document text
    • https://ckd-otto.com/contents//files/95732538353.pdfIn PDF document text
    • https://tempegaring.com/contents//files/josunizol.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a8f28a956---sagisukivuwakagosuber.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/78601046119.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/rakokup.pdfIn PDF document text
    • http://e-hematologica.com/users//file/70108948110.pdfIn PDF document text
    • http://stolocatering.ca/clients/874514/File/jonalajopawowidozezoj.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/29433290582.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/fivubofeworalu.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/0281588dd2d1895fd07ee7ddeb21d565/77190280071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=who+are+you+who+are+youPDF 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_off0000e193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE193 20120 bytes
SHA-256: 7fe970def38cee01ce113d786b4e34dd6a4155fa80951c37051a325624ed1408
font_01_sfnt_off00011463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11463 9988 bytes
SHA-256: f9f296c350a33b965214700401a7fdfcc37682b48e67fa016eafadc40e443ed8
font_02_sfnt_off00012ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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