Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4239baf89dca633…

MALICIOUS

PDF

90.9 KB Created: 2021-06-25 21:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f6fc5aa3387b9d8163e68e0d0143b00 SHA-1: 94477ee63b8761d6c0195e7546326ab13ec26b82 SHA-256: d4239baf89dca6335ea14c7f8d8e813b51ecad85796221d83cf6de0a40039932
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or lead users to phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/78c8b439e7d940bbfdbdbd9f1860ff32/50315152751.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/175bcb5ca157e5c398570b0c830464a1/75060771301.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/l0lcfechha4fh9aagolb6ugm6n/finudejoravexon.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ea749b51da5c99b658eaf19bf24714d9/wutixano.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608afbea06ce1---boderufofagenixixa.pdf
    • http://botosani.ro/img/uploads/file/waxodupufuzonokuk.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607868c08e49e---pagelemu.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/33c4beb624047a009547888d5d00fe54/zutiligibewop.pdf
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210603045721.pdf
    • http://jshtextile.com/UserFiles/file///novibugorosepowevum.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2si6avdb0rct0ha3s05am6n3s5/vonokubagi.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/c33b98e67f111c60c6b845597df9eb86/60518071635.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/bff46dc5cee2133569fcea7c7805a918/wowajezuweno.pdf
    • http://arniestribu.com/campannas/file/33522420995.pdf
    • http://szguilong.com/userfiles/files/38176409570.pdf
    • http://abwpetersburg.com/uploads/files/miwiberanoniguropixiroga.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/506392fccf9dbe4b876ef9ea294f97e7/73263336129.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/9e158b1d1955d641dddeb976d3d355a9/jogimafagegavexekar.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160810152ca4bb---13725377818.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/86f12042b34a5694ab224e655c540ce0/buvemipul.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb10d939e96---samufajagovenideno.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fb23c4f57---37636496756.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/1cd87960dbadea566be78a0e29149e24/lurekefebovotafebizom.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3831af277d---88618324687.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/1346dcfcba7bf5acc6267a7266f77593/tebekup.pdf
    • https://gilbertems.com/videos/file/xubujokosupumitagi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pace+meaning+in+tamil
    • 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_off0000f97f.bin
6530ed8260e67ece4d6891c5362db753fa9228381b5bad4303c882661842eeab
pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 10188 bytes
font_01_sfnt_off0001103f.bin
51157f4512e04737808adb87aabc3629f3ba638dd9eba9886aa8b818c923443f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1103F 21164 bytes
font_02_sfnt_off00014633.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14633 16792 bytes