Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe79604b0c2128cb…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 21:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f45593ccb80f13eac24b88a6f73ae511 SHA-1: 75eb9cd719a4f22b3bb0e309790a4c85eb88936e SHA-256: fe79604b0c2128cbf8baaa2cb24ec169b86f13b37d3a1e9b73ea572c8384f938
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://catamma.ru/uplcv?utm_term=api+level+chart PDF link annotation
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161333c521aeae---4050121064.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210904110636.pdfIn PDF document text
    • http://swhos.com/upload/files/60047696615.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/54115359311.pdfIn PDF document text
    • http://apcmagon.com/userfiles/58089982551.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/16368877577.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210905_055418.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/78848564471.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/pekibamakuwabu.pdfIn PDF document text
    • http://freeorden.com/media/file/63459317201.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161305f30b4255---60946855175.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/27008399909.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/rexifixafepexelafezobal.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/xezubagagizawatofimutate.pdfIn PDF document text
    • http://skncn.com/u/files/22107428321.pdfIn PDF document text
    • http://imoroz.by/upload/file/pixojoxebemagerip.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/49220966820.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161369fd57a492---69121843177.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/76809085121.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/8053245364.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/sogineputabunesilepuruk.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142bad56d444---54596775445.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_off0000db48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB48 10124 bytes
SHA-256: ea7c955d0adc1b7b86ca4e6ab93f6584a3ec0a333e34b5046e29d33be790f51c
font_01_sfnt_off0000f20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20D 16788 bytes
SHA-256: 4b38a8de19b3cda98061e562de412ef1e1104cbaf8054c5f640f963458f6fba3
font_02_sfnt_off00011d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1