Malicious PDF — malware analysis report

Static analysis result for SHA-256 865703c5f6da6742…

MALICIOUS

PDF

82.6 KB Created: 2021-07-07 00:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f1545a17cc6900ffd409e9b51bd30b01 SHA-1: ca5bf9770b8820cb72a96a9007e9120cfacec50e SHA-256: 865703c5f6da6742ac5479732330133f4d43327f4660e44e23363aa81234f2ba
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics identified the PDF as a link farm, with many links pointing to domains that appear to be compromised WordPress upload directories or disposable hosting. The embedded URLs suggest the document is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • 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
  • 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://ceomit.com/fckupload/file/46563597802.pdf In PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084fffdbebc5---lulanuberikorisukenit.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c94d74920b3---42274732846.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/nixitafiworedolevefexu.pdfIn PDF document text
    • http://lemanssrl.it/file/54911238497.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16078a9424ba2b---biwizokumodogunitolen.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/jokawinazomoxopinojo.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/57333149634.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/92799178272.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/96307327902.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e60bd52bd0---4850486327.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7db213027a87687fdf6ea300c8313eaa/zuwojozixaminonira.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/17694910463.pdfIn PDF document text
    • https://icbacademy.com/upload/files/86129802915.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a71c12a443---30662613015.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1c8bc179131d9cf715d4c7de7c17998d/88253602025.pdfIn PDF document text
    • http://emannsltd.com/userfiles/9978875530.pdfIn PDF document text
    • http://babamoleskine.com/files/file/nixupinigulixodam.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077f9f7472ec---viworidoparogolofizupux.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/eb219cdc51624d6fe7dcf187a3616484/pegudalumopeluderapelon.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/32236587032.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/78237900543.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/48805af6d3a37f687c17fd862a9113f4/64781675975.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/48018514020.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/lajojamazubuzizagakuzip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=going+to+town+george+michaelPDF 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_off0000df1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1F 17032 bytes
SHA-256: 73b5991e67b4fb1266bee7a335a4775988d8ed337f676a69466ada98ee79fd63
font_01_sfnt_off00010b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B21 10636 bytes
SHA-256: 919a46cbbb0696cdbabb3263370f9715c5153498b15b3431bc45035d23f7ed48
font_02_sfnt_off0001235d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1