Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ea0a6736bdd443…

MALICIOUS

PDF

91.6 KB Created: 2021-06-27 16:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e71eaa9a066cf806aa9a265a7584363f SHA-1: 27e9917ac0b8c51db40a7de8069dd3e35924927b SHA-256: 90ea0a6736bdd4435f1e1eac1bc01cb6a059490e9b23f9290ed7b16fcc61117c
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 websites and WordPress upload directories. These links likely serve as a link farm to redirect users to malicious content, such as phishing pages or malware download sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/fq5c5h0fepf5olm411k98aimu8/poxeburowefemememivok.pdf
    • http://dzbnf.com/upload/file///62332322398.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/987fe2c7b801092aec8887f6c00a7626/20068552184.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/9f73f48622eaea0f9253294b1494676e/88908790515.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1c9702664---84564169142.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/0db916c96b15498f3e8cd6d2463f7757/mutom.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bde039dc01c---63918181950.pdf
    • http://salkim.com/userfiles/file/66748116526.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/53aec55981c9b12cf8cd4adf682ae9a4/tomunovasinazetuko.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074509990563---32281166469.pdf
    • https://b2cexpressdemo.com/userfiles/file/jugipuxuvoxazaj.pdf
    • https://nezrenpin.com/calisma2/files/uploads/gogiwatigaxod.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kizofob.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/g1h45nbt9kuee0840bv8hee1qp/menorofaxejutuvifafe.pdf
    • http://color-gateway.com/userfiles/file/78407112799.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f168379ea---jefibuwivijefunaziv.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609689169cd6c---fagaluguterovonepa.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/po90bhg651kiun5f02q0e9pub4/gegakokesaluse.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/834j4mhm74l57rvnhfaha4i6m5/vigoditusize.pdf
    • http://scottleddy.net/clients/862555/File/90892936988.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/15222480c0756bbcd58503b18f4850f0/91957618139.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/087c068713c2fd467e2f3cf859672a4e/90601392456.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/kp7qdnu1qdmo7fe9m3p1um8vd3/wusinanilep.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+foreshadowing+book
    • 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_off0001041d.bin
0f3113b0689563a2f55433c61dce52a6bfee9755e1c11efa82b41f3a1322508d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 10768 bytes
font_01_sfnt_off00011cb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB7 16792 bytes
font_02_sfnt_off000134c9.bin
9d50d8c8a742717e8c1607c9c2a59332b2488d89bef969acc9aad84ba9b805c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x134C9 17264 bytes