Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ae13c7c1952df2…

MALICIOUS

PDF

87.9 KB Created: 2021-07-24 20:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7622fb9e61164ebfc35574ea2e3af629 SHA-1: 8ad3705cb18304184cbdc25b3a80199bbb2891f4 SHA-256: c5ae13c7c1952df2fd222d2770227e6c9782113e969fbf3b679f3ad7ac5b1763
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/hiuracv6amhq9lejtms0aoll30/xuvebetuzajut.pdf
    • http://dichvu12h.net/userfiles/file/zixoz.pdf
    • http://balcimimarlik.com/resimler/files/jirovegesukebe.pdf
    • https://schmitz.cz/res/file/totitikedenigibenasojik.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/9cfdf58c91d55e0349ffb5dc50430a3b/55072308191.pdf
    • https://rpitrade.com/ckfinder/userfiles/files/xulinaz.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16077572a02ad6---xirulomopegipugusu.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/a3de4a24271462202efdc9cb0f11c6cd/pufaxaniwurufokimekemevof.pdf
    • https://performanshost.com/calisma2/files/uploads/46871381596.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a65f36474dc---49073532979.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/n83uollapnctmgdp77f304hnp6/zovixazifiwezalefapekob.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad047e0fc76---buned.pdf
    • http://ersatzmonitor.de/userfiles/file/32861164450.pdf
    • https://itchanoi.vn/uploads/news_file/zetajivasap.pdf
    • http://sgyscom.com/upload_fck/file/2021-6-9/20210609231947440420.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/edae3c55018521d32833b38ed07b21d0/gosulowesibedosojel.pdf
    • http://afghansolar.com/userfiles/file/71382611512.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53c5fd02ff---6249152496.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=free+download+mp3+opick+album+istighfar
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ae.bin
1a32d72e0f52deb990fb396584d7fc98fdbfe6b3be51cf64869bbd73b9e12e79
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AE 18740 bytes
font_01_sfnt_off0001089c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1089C 16792 bytes
font_02_sfnt_off000120b3.bin
d198430cf26f677bac5ed4960de544b02e9c57f7dddfcd0f2dd2c83b8249923e
pdf-font-stream PDF embedded font (sfnt) at offset 0x120B3 11636 bytes
font_03_sfnt_off00013bcc.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCC 16164 bytes