Malicious PDF — malware analysis report

Static analysis result for SHA-256 9911312aa0df9e97…

MALICIOUS

PDF

91.0 KB Created: 2021-07-06 15:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 38534f2bb0723bcf792f4eb0edb0e8e9 SHA-1: 6b47b72eab1af13fbab46d5e4b73d202968d7401 SHA-256: 9911312aa0df9e9741dfd4adc9e0862605b5ed082ba541f7043317a6a62be7b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://queure.ru/uplcv?utm_term=resident+evil+3+xbox+one+cheats PDF link annotation
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff55ab9bf2---teruwuvofapokujemesibiwel.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/viwebakisopexoriw.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/sibumebodorokumoxur.pdfIn PDF document text
    • https://ntc-container.com/upload/files/nigubejozodelevagupuzegiz.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/fbac5ab00ccc9a40966c9d7694a21d09/busite.pdfIn PDF document text
    • https://orangerun.re/photo/files/29622599094.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/b100c439449e03634f6bdc1bd05656ea/16967929357.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/50925980769.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/81835077082.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d63ffaf35d---lazokatizimasi.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/bebusasetejefudatuna.pdfIn PDF document text
    • https://doganagolosa.it/file/gemekidinu.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/xoxagomamototalubikisa.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/negoxavorakozolokexuwager.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090b846d0849---kivuvisidarakulatukidul.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd9c61f6b7---jupelob.pdfIn PDF document text
    • http://dalaichau.com/files/13629784292.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/13b1c9b106de97c5cfcd14d039f9c5c1/kopomumefosefigikiluli.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/9fe8b50588e01b3b49185984e7b57d6d/79691345759.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e0dea173494---45011906270.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6e0b5fda4---51958937012.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf08cbdd0b---36320171949.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607197d19d563---lagerumeziliza.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 17304 bytes
SHA-256: 8c449c5b4cf36b31374b27be280c9c4961b8c30c427c77cbf259bcb198b123d4
font_01_sfnt_off00012d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7D 10892 bytes
SHA-256: 841bbfef4a6b1b683100964cecce1dcd87e5dcdee0361e608c0bc09bacc7e63a
font_02_sfnt_off000146b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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