Malicious PDF — malware analysis report

Static analysis result for SHA-256 885c573645f9005a…

MALICIOUS

PDF

90.4 KB Created: 2021-06-30 07:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a90b0914b8e3cbb0ee03fd9c97bbde4a SHA-1: e393213cf1b9ca45920f476aea3b4acbc7289adc SHA-256: 885c573645f9005a373e36a1bea977596a740c4dc520a217260e657e97778c12
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites, suggesting a link farm designed to host or distribute malicious content. The presence of a 'download' button heuristic further supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=git+change+branch+name+local
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921209bdba9---58080983896.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607953301313b---56241883093.pdf
    • http://rajskiewakacje.pl/userfiles/file/16247156675.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef05335ae2---nunitojijikifulatowa.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/830d7524fecf667eebb801506f15d3b3/vigawijomarojozegaberiz.pdf
    • http://avstralianature.ru/ckfinder/userfiles/files/98114933098.pdf
    • https://skyzoan.com/cake/beta/userfiles/file/ropavena.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779730ea042---filobosuwabatadojamuli.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f919c1496---26403453336.pdf
    • https://horizontire.com/userfiles/file/65895827703.pdf
    • http://p-itos.net/admin/userfile/image/file/28248860559.pdf
    • http://sieuthibongda.net/ckfinder/userfiles/files/27360547643.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160aa05489665a---xefokinetiputagixula.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/rifunowetafax.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608518d61f4d4---44048984092.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b767b2b14---37988586919.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609820ccbbfa5---vazezurez.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75566ba840---65859726128.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a567f90e16a---kazotomuxizugadatin.pdf
    • https://amatnieks.com/pictures/image/zagopigebilib.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/gql9dkpjnf19u6sd984f1pfjtr/pomupofamet.pdf
    • http://griswoldremgmt.com/uploads/files/najuseno.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3efc623921---divilokilak.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/64899555492.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fce3.bin
835c267f6ba8ae8567bb772192cf939a92176f9ebbcb1c2626a93227018f1b20
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 17760 bytes
font_01_sfnt_off00012c13.bin
49d719d7149f3fb35f797ec0c7672a309e71dfebecd75e43a665abd912c8cddf
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C13 10688 bytes
font_02_sfnt_off00014468.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14468 16792 bytes