Malicious PDF — malware analysis report

Static analysis result for SHA-256 0472beb59e186648…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 09:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 39ab290b9cf87b898f1b6842bfcd8eb6 SHA-1: 5adacae2e3a8773b6ca44f266e51d24edf974351 SHA-256: 0472beb59e186648ce9b374097eb6c2a14eb16bb053215b21183d3eb225a8b7a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised or disposable domains. The presence of numerous embedded URLs, many pointing to PDF files on various hosts, suggests an attempt to manipulate search engine rankings or redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://werbemittelag.ch/upload/file/91879653652.pdf In PDF document text
    • http://rolmech-strzelno.pl/Upload/file/zogamuzawalepoku.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/sizodolamaleserikemupovi.pdfIn PDF document text
    • http://fxmeat.com/upload/file/9a1cedee9249d93089429c2c4fa4c3e6.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/lobakebifefarasewel.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/pimerosewutidegunepos.pdfIn PDF document text
    • http://dzbnf.com/upload/file///sazawilarujotamenumas.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/pugubaril.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e67889d355d7dd827e4f7fde0d68eee5/51936151164.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d737bce922---pimesumeturudupanabomo.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/98682373806.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e91c709ce7---kobuzomajikenav.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4903e7511---degiporudedogibexab.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/niveribefugizomoxu.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/wururitewojerofuririmive.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/kaberodigiladerijuzeru.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/kamigimuvisexosogikapiko.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/nafenaroxaset.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf49ee281f---ralusifog.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/b91062b9d2778361e06b8f11b9c62b94/12537023544.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/pru34njdeceqhe355qeph07jt1/dowowurimo.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d6dbed9a5---44566825449.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/fedobi.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/1f2b5d4fbdadae0a71fe3da6ca0b8efa/mexugoxememag.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210830_E891D8BDEDCB97E2.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=harga+serutan+es+batu+manualPDF 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_off0000db32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 17460 bytes
SHA-256: 9c17d0f271541ce4000d8c716e84f64b3eae01a84281872966f449ad30062257
font_02_sfnt_off000120a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A3 10472 bytes
SHA-256: 7a122686b22b7d3b66f1d1a4e3eb5fbb400d002c71ab4cae78805fa0f0db2eaf

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