Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2752e4a4c85634…

MALICIOUS

PDF

83.4 KB Created: 2021-06-25 14:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1ad0db762dbddaa9ba36cfae2cdb2cc SHA-1: 7f054981285c33b19377f30a900a34efa7eb7809 SHA-256: 5c2752e4a4c8563452432946e96b4ee1b13467c5b8a3e81b008bf6559795a7ca
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these redirects. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://alajuusa.ee/media/contents/file/gupagese.pdf
    • http://sotel-perm.ru/site/file/libikutixedani.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/84d5fac3bf6ff0764959a4b6df8efecd/welodinijakebofoja.pdf
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/lodizajexosekige.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b1f6c8780---67174746358.pdf
    • http://kursadowicz.pl/Upload/file/9841659483.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae90b94797---nobumegupatulo.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e4c671a80---gabizosis.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c5123fa6e---19200031869.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24a9bbee3a---32410663256.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/fb7aa48fdac23bffeb3a1c1694d91971/81665446591.pdf
    • http://studiolegalezullo.eu/userfiles/files/wowiworo.pdf
    • https://muratay.nl/userfiles/file/67089459055.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/eedf2d36507dfc74899025f485d43778/rajukape.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a23bd1a1e---63908987980.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c719197421c.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e1418e84db70d36fd6142de70d3c023b/kasawozesapojano.pdf
    • http://kasystemofkarate.com/clients/861259/File/19969834178.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=i+got+a+feeling+like+somebody%27s+watching+me
    • 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_off0000e134.bin
3b4e3feec2ceab18e2a0f2b3001962d24567c3cbbf679415620ed4bc5dfd841c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 11240 bytes
font_01_sfnt_off0000fb46.bin
d17603af03d2e965a560b8cab5f5b0201209413387dc9999d42b303ce20dce1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 17252 bytes
font_02_sfnt_off0001286c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1286C 16792 bytes