Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc9fb233999c25d…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 14:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bbb4d7abd00644661f0ba661dacac7e6 SHA-1: 36252651860d52eff54fc86c0a4db2fbdb966413 SHA-256: 3dc9fb233999c25dd5646d9876c1f28508d403aae55a0f0c3e576668083ea3b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://szigmetal.hu/editor_up/87514084304.pdf
    • https://futurefacesnyc.com/uploads/file/kefixemusenoxi.pdf
    • https://shen-su.eu/gfx/userfiles/files/nikafojetakirepovepudowip.pdf
    • http://cowmoo.org/ckfinder/userfiles/files/98642314958.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ieub02joki16n389g0bodm8jf9/36808267813.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f21893c085---degerutovose.pdf
    • http://aucoindeshalles.com/menu/file/82510746807.pdf
    • http://j-line.ca/fck_upload/file/mosaruvuzexoxavomajas.pdf
    • https://inverpalmas.com/aym_image/files/metilibab.pdf
    • http://farmaciafici.com/userfiles/files/65812493731.pdf
    • http://jedzenie365.pl/ckfinder/userfiles/files/93684019268.pdf
    • http://stepasidemedical.com/images/uploads/file/fofovisesusoxasoxafotov.pdf
    • http://danangsculpture.com/uploads/image/files/joxufiwurer.pdf
    • https://datajournonepal.org/files/dosepawig.pdf
    • http://keacg.com/upload/files/9918666498.pdf
    • https://heritran.vn/uploads/news_file/68516665245.pdf
    • https://gamepinleri.com/calisma2/files/uploads/3121095088.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/722bf21034519cd154d8f74b412d01dc/59926205819.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/2f263f7def76cbf3178346137ba2e2b4/wujinijixunujixijefu.pdf
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/76864373640.pdf
    • https://endeligmandag.no/e-brev/data/div/56893764948.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=redmi+s2+android+11
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b055.bin
e5b3752ce0b39317c4ea7789e460c56321804863b89082af642c34be7b45c871		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB055 10484 bytes
font_01_sfnt_off0000c82d.bin
136fed5cb211e79a0eb635d3de44fd386224016c41f1b60999b08c9211790d33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC82D 16832 bytes
font_02_sfnt_off0000f386.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 16792 bytes

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