Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc68c3b6ca496857…

MALICIOUS

PDF

89.6 KB Created: 2021-08-15 00:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c6bff82ea81644ec45ef625b1e2b9f3 SHA-1: 7f2e364b918673616f1dfd4b355d759d54dd6961 SHA-256: cc68c3b6ca496857cdc3f4630b78ec0fb234bc97295f63c40e999a70c380db69
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Analysis reveals the document functions as a link farm, containing numerous URLs that point to compromised WordPress sites, suggesting an intent to distribute phishing content or further malware. The presence of multiple distinct hosts and the use of URL parameters like 'utm_term' indicate a coordinated effort to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff594e78c---2137959579.pdf In PDF document text
    • http://ats-dz.com/userfiles/file/20983798916.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/85452684821.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/ruwatodape.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/wunivedenegipemizobuluwi.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/murogudabifolu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/99475532341.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/ligukowupalex.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/joxipigomufotiseposeniwif.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/74347223149.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/1302ae1df99a0256f5b2c31051cc5e23/womidaxas.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed079413587---31549935703.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c4bf2ce73---18644261509.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161002969d66c0---fawitevub.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/d038a9c7f1fbfee6fd93f72546b7b2f5/7911063473.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/23801268683.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/9613921734.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b5fff0f80---55835371995.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7eff10b5e---bufuge.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d196df7feb5d6e876906adc935f65b82/27700696446.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/d4761d16caeee93904e778c8b2486590/lozubemawuzixasumowegu.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f77370405f4---52479117510.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/79983072589.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/voporidudabozugulef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=lg+lsxs26326s%2F00+freezer+not+workingPDF 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_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 11140 bytes
SHA-256: 3c168aec99e693a3980f92de3dacea5c5b6169d999a4979d8954dcc4feab5ec5
font_01_sfnt_off000112bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BF 17404 bytes
SHA-256: e5340b9c537bf801deb5155acf9958bca3373c38b25528e2b79ccab0d839cd57
font_02_sfnt_off00014033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1