Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5b8754692ca707…

MALICIOUS

PDF

71.3 KB Created: 2021-09-13 09:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 907ffa1c97008a66eedbe04a8054e546 SHA-1: 7ff8de548a1cf8ef9c2e90bf32ab8dd6f06bf5ca SHA-256: da5b8754692ca707bc55e87b791746782041f27c24d8865eafbed628a72971f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or scam attempt, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://smsenerji.com/resimler/files/24000794777.pdf In PDF document text
    • https://millersexpress.com/userfiles/file/24280472800.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/madokijodagibudumoxokub.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/77684566339.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/pafofebonaxodubusekunokes.pdfIn PDF document text
    • http://kite-surf.sk/files/sigube.pdfIn PDF document text
    • http://pnalog.ru/images/file/45815154541.pdfIn PDF document text
    • http://coumert.com/images/file/jenufa.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132f40b0ac32---fezojasolijelenisokejijiv.pdfIn PDF document text
    • http://aurora-c.jp/files/files/dumeramubunisitepuvojut.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/a3ok22f8d7uc57g8oguid1d366/nitifawivupilitususum.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/tubomo.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/fp2gj38dei3d2u4kj7i8dornnc/femirusenif.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/sabagu.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_07_11_02_11_5858.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/weboputoradebi.pdfIn PDF document text
    • http://dsagco.com/Upload/file/zogotuwasizimabadi.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/11071354918.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109071053051966.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/30196948764.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/47491033113.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/29374383197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+update+to+android+7PDF 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_off0000b5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EC 10396 bytes
SHA-256: 1896f4ca697aadd43d658767d133dcc545414c917876168fb751203c9ab5fad7
font_01_sfnt_off0000cd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AB 16324 bytes
SHA-256: e9e0999eb33a1214415064ea4a14ec19fec872d9b2875cf25de01316c1c4dc5f