Malicious PDF — malware analysis report

Static analysis result for SHA-256 b138808e346d0c13…

MALICIOUS

PDF

86.4 KB Created: 2021-09-02 09:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ad6210e0c542f2183d4756a3a56efef2 SHA-1: df16d3c5554fd4056479c742602317ebbf073b4d SHA-256: b138808e346d0c134bdb509c5ea90da424cebbb13ba75e7701ef80e2e0b3deb5
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=redial+the+last+number+that+called+me PDF link annotation
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079a4a0933ce---2659535087.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/94068071066.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b838bb739---zutodajafapodabonudidizun.pdfIn PDF document text
    • http://vhktn.at/images/content/files/61609052995.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/78547523961.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/pivir.pdfIn PDF document text
    • http://retrofotr.cz/files/file/99738091776.pdfIn PDF document text
    • https://irrisyst.eu/files/file/dimonoziripovosoxulovoj.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d3e70039b---55906386759.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b93bae0249---gozakagejogib.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/sesiwozumuzibuwiwunokune.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/18708439220.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/48344897344.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4ae8c43d1---65811332266.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/kokedi.pdfIn PDF document text
    • https://tomas-music.com/contents/files/nifexopoxe.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/78b02c60e4f39146e4e6a8911fc6cada/86145722856.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/57865657084.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/44467005974.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/24318362641.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/5df69bde179e44fe1ca2f4386c279ee6/kajenet.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/de35i4ahoknt84c8r71j38tj4v/40941577778.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/16348584488.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_off0000eb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 10800 bytes
SHA-256: 8e9e1ef7d1e5d81e957d65afa492c930bbf22d411dc8056ae2f1763ac337acb5
font_01_sfnt_off000103df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DF 18332 bytes
SHA-256: 18c3d38c9535ae782435678e9f72ab805b773d5914f43666329ab6f5089a5add
font_02_sfnt_off000132f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.