Malicious PDF — malware analysis report

Static analysis result for SHA-256 7048038c7e9ecc54…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 08:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bca53d9098aae59d54885c79d48e1e81 SHA-1: 31828e84e71af08a6751643e3e85dd0cbb74221a SHA-256: 7048038c7e9ecc5402fac944c16a90252f31b56e9f628643e874d6da0c58e993
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The presence of PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM suggests that some links lead to content hosted on compromised WordPress sites, a common tactic for distributing malware or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://shahnawazonline.com/uploads/files/xexijubodabugila.pdf In PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/zamafa.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/posar.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613099037985d---xuzukizadokur.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/13098740105.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/lususebirituzopepifivese.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/92573398154.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/wasewagerolerusobokuxagiv.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614dbbdf237d1---62962906149.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/63369204799.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/63851212599.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/39249757824.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/qnsf3fflo68vu29q97uhnnpsg5/jobowowerufumelopujizekod.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/miresamadufamijob.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630613516.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/botajovibajevew.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/pifepaz.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/88162077255.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/pibol.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109181205014976.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/bujususugefazobavakafiji.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/panuvuvopomameruv.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/gedewimap.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/disezonogirebaj.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/10130407304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+get+current+app+versionPDF 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_off0000b018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82A 15092 bytes
SHA-256: 7043195d622ffebd09fc5b7be7487e1838068a65ad5e5e82a681335813552f4b
font_02_sfnt_off0000edc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 10788 bytes
SHA-256: aa7d5be6b0286953508ecd5a6f21888b5ca29f530481ac583450e75e2decfc49