Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe65df9093eafb44…

MALICIOUS

PDF

94.1 KB Created: 2021-08-31 01:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 684a97797012b05142b7b1c481c0bfb1 SHA-1: a6f57b08a171db81f485cb2a9d642b980a547804 SHA-256: fe65df9093eafb441ad653100e9aa8895c5769813bc0b043437959da9940d708
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised websites and disposable hosting, likely serving as a distribution point for phishing or malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tele-fonika.pl/upload/file/40871131496.pdf In PDF document text
    • http://massintech.ru/img/outer/files/50338733258.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/0b6c31d399c1e255a566d7653bf9163d/22194399206.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161006c2642b82---87146477075.pdfIn PDF document text
    • https://kristinanamaste.eu/files/menaragunutobozafog.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/8d375b34491f1cc2952548851a3f1f39/41129025684.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///degozemumijumakixu.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/52398579e3f1d57017b19e8dff2b80e0/xufudefabemis.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32541f4e3---48054879882.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/6c4pr4niute28sjsrsnt3hj1j7/14652213869.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/32443893779.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/44787814310.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c41e94a8ae---5407362039.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/jk16vmh5q9ub0mlbhmlt9jpkc7/rituwuk.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/juzejaxugazifunoxavujapu.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/zonabaguzujosora.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/4ee783304db3ce8a53fe78b07717e53e/begip.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/0bcd7aa3cf728e463c10a4d0a39e23bb/10471439527.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac3b079fed---wonagesuj.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/c88f131b5971f99c8d6863ae66ce0e8f/tetenarepofelazofase.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a446321f63---gakosixigaburalabupudomo.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/b2ec3v60u6ru9naosm7urrc8on/26693966509.pdfIn PDF document text
    • http://showpelec.com/data/file/20210827_112011_756.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/zewubazujizomevoxas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+evolve+pets+without+membership+prodigyPDF 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_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 11072 bytes
SHA-256: 6dbccfa7d983cfca6b570271df98e5fcfe06637e077f2a53cb0e1334a955c516
font_01_sfnt_off00011fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE9 18880 bytes
SHA-256: d7b76e9487516b29039f3f369eaf98bd87f77aeef3c292d75c1e30d28c020121
font_02_sfnt_off00015144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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