Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6c05b821c2e359…

MALICIOUS

PDF

70.2 KB Created: 2021-09-24 08:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 660aba6095ce445290949cdb9f5c001b SHA-1: 9ce33f6a27d503b171c876686e5129ae03849403 SHA-256: 8d6c05b821c2e3598ebc6288700e98efe6774447910fd28110277b5b0a89e027
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable domains. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/33228092614.pdf In PDF document text
    • http://ateliergermain.club/sites/default/files/file/86213235106.pdfIn PDF document text
    • http://tzsunup.com/upload/wozotiwexipuxivepela.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/16380813306.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/41161838448.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/lakodazuziwagozagidef.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/zuzilunilarev.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210919_171148.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b4650a3f0---dovinuxetibu.pdfIn PDF document text
    • http://unsersohn.com/images/file/sukuxuzuwojosebotofeporog.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/13209660766.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/74391455583.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/406c1e1c985a6f259bdaa2fd4df580dd/xadisunufunajukaminilor.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d475f91afb---95531730300.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/4af0533f5759113030627f01ef24ffd4/20454567398.pdfIn PDF document text
    • https://stormester.no/files/file/45054108969.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/57642957146.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/dovizi.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/9618537488.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/89929068870.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/51773253852.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/e1ihkg9sriputf8djie52uprj0/80060628441.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/dogus.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/90169504773.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/fojakasag.pdfIn PDF document text
    • https://birotex.rs/images/files/xukula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=windows+phone+vs+android+vs+iphonePDF link annotation
    • 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_off0000b633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4A 10488 bytes
SHA-256: e631a8afaa34955b9496f76f3848f26b38c714222e197ca9a6830e501f9c7dc8
font_02_sfnt_off0000e616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE616 14660 bytes
SHA-256: b0fae44be74c468d4848cab768e08e636e27704a0f05808e41b55beaf15c4393