Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcdb2c62a631ff30…

MALICIOUS

PDF

71.9 KB Created: 2021-07-24 16:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b5a1556547c86dcbae00ac99c3ddaf77 SHA-1: 906351ad02d08b579d125d5a44d17efd396ea396 SHA-256: fcdb2c62a631ff3088c7745ed778ae593d3d3a0119a2e8d5ab4914fd5acf8b3c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, hosting other PDF files. This structure is indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/e0e5b9c644402abbfffeceb38ab9fc38/78221644289.pdf In PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/llmftbi04fljqn4hp71alhokte/74875603636.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3bbd5dac7b26f4f704979e99830e3827/33141655396.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a456a536d0e---96195841528.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084249d3345f---lolotuwixomu.pdfIn PDF document text
    • https://efnnma.org/files/file/88368074785.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/1a547d26641f33106931ce401d951b9c/kurikusadativo.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b69994eecc9984d359bd898348086ffb/fikuwefobigusejo.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cea0d87ec---43990826603.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1473e1735---34058857428.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/19520054187.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/gimidujogir.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/91302241921.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db01259e51a---20098694317.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/27312124770.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/kiwopofege.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/seselokawujajovotilesewal.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/39ac291f7a69d354a2d524fc6d699fde/gemesu.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080ac677ebf4---37563218912.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/ca67534d55e19d170e8ff8cd0c12f063/48230354949.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/pidopodo.pdfIn PDF document text
    • https://iohrp.org/f_files/files/54561990168.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607753d45c2c1---polilajibupakoxadafeneni.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/f8pa90skfoe9cv9nuhftll9fn9/mexiwiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=hack+para+need+for+speed+no+limits+android+apk+%2B+data+offlinePDF 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_off0000b7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BF 15700 bytes
SHA-256: f21f9b89df2b45eca63e689e406e98845e48b9742d29acdb5cb7f0b211d45341
font_01_sfnt_off0000e046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 10864 bytes
SHA-256: fe75de52a5ae6571e4ab2bfeaa959c6e82d90ca9fecd63f53ee787aadca701df