Malicious PDF — malware analysis report

Static analysis result for SHA-256 58548bad25198a6d…

MALICIOUS

PDF

117.2 KB Created: 2021-08-24 03:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8542879eac5de086da23fe96ab0c3678 SHA-1: e12a0cff0bd8622386b59427865b4a5cc3de2d6b SHA-256: 58548bad25198a6d7724a90226b3b843858c7670f79f60db37ca3d09973541aa
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised upload links points to a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://abwingsjanaf.com/uploads/files/sibefelotude.pdf In PDF document text
    • https://anmimar.com/royal/userfiles/file/54586134345.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/vo0mab7jttkr3l5d6aavhe0uf5/luworafukubowogigu.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/xapedonoribo.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/0649632f473997f1cb75c775378dd5be/83903252041.pdfIn PDF document text
    • https://foreningenflex.se/anvandarbilder/173/files/gedalotuximizosimuvabux.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/ledegomirew.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/98732883883.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b838ae6aa4e---xirigatafivabibanatubun.pdfIn PDF document text
    • https://path.mn/userfiles/files/5224964923.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080fc7a255d5---13552425963.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/sizikerojo.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160706a7dcd393---79599125908.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/93cf944057860b541539a91cbeac7717/39971263753.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081532b2dcf4---86375163375.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/zadukatuvugaxutonugufomiw.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/43636670985.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/21266471618.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160720981bd7f8---sexemewutegefox.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0905317001627885251.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/68640975750.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/84231173061.pdfIn PDF document text
    • http://toyotarentcar.net/FileData/ckfinder/files/20210624_75FADB061F407D6B.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c97746e978d---kiloliximabad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=fifo+lifo+avco+questions+and+answersPDF 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_off00016622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16622 17672 bytes
SHA-256: afd26bdb0a8fea077f4749281effb57a69a8798d67d54ea91d3e0254aa5391cf
font_01_sfnt_off000194be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194BE 10844 bytes
SHA-256: 1615ae7f242f538497678de8289a861b0ab6e8b5036b26ae292c9843bded36ff
font_02_sfnt_off0001adc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1