Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ab38b6917e102e…

MALICIOUS

PDF

77.2 KB Created: 2021-07-29 19:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4c817a3ed3b563d1077da52b3883ef11 SHA-1: 15b84c9d28932c4829929ac816d635a1bdc6769b SHA-256: 55ab38b6917e102e076fae5e66bfa33101d589e36983ba6b4dfcd1200a1cfe30
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest 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 0.9976

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://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/vf43q569762v3p6vdn27rf8na4/ripanujigaxu.pdf In PDF document text
    • http://abwlargo.com/uploads/files/44372980465.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/fufudisigekozunatafonojo.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d109b0ec86---gatipapowodibudetusan.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/jalapizumojekugalokaneve.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb7cbdbf72---gedilexujamuwewib.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607797a43b5ad---buwodi.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcc8eef79a---5201759841.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/85457320428.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/romuwegudumezibuvezujaro.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c278acff1---60169169845.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16091b516912ee---64965981.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d90a6267fe5---sewizibafepawosugokozar.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074022064a77---molopesexiwevulumifug.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/7e0lomki2t7s4ja8g6in79m8qk/4789790637.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/98419459651.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/43183824669.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7af18bc15---16183313489.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/kk6f2j1hcs4k26ets6g5onbh3e/doregidiwimatakulefaga.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cebf0424b3---lobilop.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/kifabelumajikagisuxewomo.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/dogonalijinog.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/77944771082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=compare+and+contrast+c3+c4+and+cam+plants+quizletPDF 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_off0000cc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC58 11260 bytes
SHA-256: dc3a1832d4c89d6cbf46f04f2d9f480f5e4fa9dc14e7af3dd9907855d9b296f6
font_01_sfnt_off0000e69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69D 15780 bytes
SHA-256: 1fb373b6961fb05c3b71c7b4ed2f371b1563cc8c07166e9f2c83590ceaab8234
font_02_sfnt_off00010ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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