Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee4f9d75cffc058…

MALICIOUS

PDF

85.7 KB Created: 2021-06-28 00:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9207366f3a1f656685c331cbfa527396 SHA-1: 7588963a64558cddf8fa06302e259fc0e98244bc SHA-256: cee4f9d75cffc0582380f3f6056e4f8c6260201896c5f045a13edca5ff66c717
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URIs and link farms on potentially disposable hosting further supports this 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 http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4072e4d8d---66405921611.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081789098feb---zosuvavajokonu.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/fb8301f2074dcc03131b321da12a9223/melowapigowagitaxema.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66aaabe299---tenefelofikadovor.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/05f6k17921mmv0g3nl4l6ks9ij/pilutogexivowovusijopogis.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/1f76dbf9a40ca735293cab04397faefe/polurifutunokiguwixar.pdf
    • https://cplastik.cz/data/cms/file/40796758447.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608459658d786---tojenoravepipodofeseri.pdf
    • http://strandedtattoo.net/file/vorupivimixijaro.pdf
    • https://plasy.com/uploads/file/94842850339.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf8200124b---bawomidagadotazejagoj.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/9fr88auqeu0l9si4nj27m2d1ds/sudisasolubebibigenir.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc4898f435---52327217535.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/r3c61kaeobihk6tu0eli1ekqlb/16841864046.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/b702abf678d04d31b5ff99f7116362d5/12409040139.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2114f3ee1---16177126256.pdf
    • http://kiavysocina.cz/UserFiles/File/30084838740.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071cf0fb3189---xerifafunalawuzukekew.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/af0b63e1746f67a9c7de867d2cc8e1b4/madogenunolixexa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=can+you+become+a+member+in+prodigy+for+free
    • 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_off0000ec88.bin
fe43249462a944beb9b57268b1d72c72896d89e0b54394b1c46250aa734a1517
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC88 11036 bytes
font_01_sfnt_off000105c0.bin
7127f6dbb9f9064302fdb67b045993807b36f4f55afc68ed2516b417822d0fba
pdf-font-stream PDF embedded font (sfnt) at offset 0x105C0 16824 bytes
font_02_sfnt_off00013179.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13179 16792 bytes