Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55e45a0a4c9df57…

MALICIOUS

PDF

97.2 KB Created: 2021-09-05 22:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1d8f99c4b8670fc5f002a00069ccfd4 SHA-1: 4f13a38164a6275b70dba8e529127ea629de4bbd SHA-256: b55e45a0a4c9df57cf8e2f6e69ed5907ce1b9a7555413eec49b711db0684428e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer a malicious link-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b2ff8174b---20341859398.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/32150c2a5022999b6c43409488c45459/72102377522.pdf
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/plfp2qn91lk92218b8oc6aimi6/vilenibodezamusagijeg.pdf
    • https://bataretak.com/img/files/file/85863474014.pdf
    • https://cubic.is/userfiles/file/xemizubavutuzalitetajelas.pdf
    • https://menlopark.com/wysiwygfiles/file/kobaram.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094281b8de70---kolovanotipuwuzezale.pdf
    • http://mariancozma.com/_user/file/kukosagufobinolutedebedot.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/98445469242.pdf
    • http://astprom.ru/sites/default/files/file/xiwakeze.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/gqqng7tqjncop4bv9n68i7otv6/72404842805.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bkb9e7k8qd7j458lkdg79sd5m2/masoxomipokigepejode.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/oaitoq0urg7lg7tlb6hshop11n/lirazivujazuze.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-14/20210514202415895785.pdf
    • http://bigredclassof1960.com/clients/879476/File/gobuvejafipokodujifud.pdf
    • http://kdwatch.net/upload/files/2021080523485892.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/25024150e5a748ef876696b03a1488bb/soxesuwenafororununo.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd9df256e0---2008487583.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097415c8d86e---kezuxugezijikanul.pdf
    • https://lamaisonducoeur.ca/upload/editor/file/venatokewu.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/81d0f4041b62991e43ea171b2aa8f9d2/dopukesekiw.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/d2c4b52164f16653ead1d5cc3bd338b5/27971976771.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/e293387af89ee440aa65e540700d2092/gegosojirak.pdf
    • http://zhongguohuachun.com/d/files/fidemozoforine.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fa09b0fb2---dalesilovovezudawe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=solutions+advanced+student%27s+book+2nd+edition+answers+pdf
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1b8.bin
228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B8 1888 bytes
font_01_sfnt_off0000ea7d.bin
fd6bb380ab32e584ef815f2b7d017a506f183b5c0f62b0e265537fc5502c9025
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7D 24316 bytes
font_02_sfnt_off00012924.bin
55423d24b974947faa5e57d776b8fb792f856d32efaff37309d657d2518d7d5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12924 17048 bytes
font_03_sfnt_off0001424b.bin
3d362a4908acf02210b47f18a9cb11b2597bc8b477047335b083312e949139f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1424B 11324 bytes
font_04_sfnt_off00015d03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D03 16792 bytes