Malicious PDF — malware analysis report

Static analysis result for SHA-256 2758caae2dc0cd63…

MALICIOUS

PDF

90.7 KB Created: 2021-09-02 01:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f1ae8eb1ea9d48d18e40409b7bdcdd1 SHA-1: e35e0165cd00ffacbed12298729b0d5612fda90e SHA-256: 2758caae2dc0cd63c814d8dd3be793ec6cc38581ee2361b6c612997363711548
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to external websites, including those hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or phishing pages. The presence of a link farm suggests an attempt to distribute traffic or obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/gorulusudopupif.pdf In PDF document text
    • http://luchetti.it/userfiles/files/tolunofatakodorolevewexif.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/l1chj557897kuqsr6q81anh5d3/72373745846.pdfIn PDF document text
    • http://bronia.org/userfiles/file/nafado.pdfIn PDF document text
    • http://tkvolley.pl/upload/files/xixotanenewopuf.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/fabuzisunefedolijovevusid.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160afc2cd3bf77---62172112630.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c60ff82215---lanaxexirisozixamedegome.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f62c71c286---lejugevigigejoregowila.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160acab8eeefe9---kutatejufujotenisaf.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/fipusexazotidupo.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efc98a8beb---bibefesanekagi.pdfIn PDF document text
    • https://np21bellapalermoshopping.it/file/vusovud.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/73650395579.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210719092450.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/508db8731c843d435744e5e1f3ac18aa/77774650900.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c374839f034---6688308804.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079f50663378---97075143236.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/35288776952.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/fogubugokisesiwasapi.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aa96c30d1---lanusi.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/68054677574.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072835af36ad---jedonixuxepemurupafuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=testing+interview+questions+for+freshers+with+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_off0000fda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B8 17740 bytes
SHA-256: 1c3710d7558486a9a0cf5f8178de982a7e629945c640ce880befaa1d5d1d07c2
font_02_sfnt_off00014401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14401 10808 bytes
SHA-256: d914e1b48731ef2287bf981a23a19031021c1c734b4534400fd26430814fdd29

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