Malicious PDF — malware analysis report

Static analysis result for SHA-256 111ce1f37fa51e34…

MALICIOUS

PDF

74.0 KB Created: 2021-09-14 22:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed99576d6ee0ccb7778ec1f5ac5e8cdf SHA-1: 5d7cbc20045c4c413ed091a3a6066342d3ec2fcc SHA-256: 111ce1f37fa51e34d60b0bea56fd78e63d6df8b2033bed610e1fa630f40bdf7f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/933315cfb01fc00c34ae161aa8d86fbc/vepak.pdf In PDF document text
    • https://totounited.com/contents/files/wirulojudoludata.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/7vcr8r5i5e1o52jki2oi0h65dh/dobuvasopatubasoda.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/rifirofame.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/notisiwike.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d963e5aa8c---xararezilewoxan.pdfIn PDF document text
    • http://state-lithium.com/upload/files/8429143604.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/129e6102737248071cad6575806fedbc/45808384436.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/54820015942.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/31685789348.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/mufibajodoxagikusuzipapam.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f49e129de8---letebiliba.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/zizegi.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/pomemugumedujo.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///lumowavazixugalewutuzigep.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/lenozero.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/pozekanoxokazazazusetep.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/nafedidonijonepiwomatit.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/jelilovu.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/53531035101.pdfIn PDF document text
    • https://olterus.info/contents/files/juruvivuguvoxopirivowumod.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/24064751486.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/suzetukob.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/246926b45084b087c812131df6085c76/migegobuvud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=free+fire+hack+2021+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB414 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_01_sfnt_off0000bc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9A 18572 bytes
SHA-256: 9966a20fac7bf455795440ab8d2c8402a2d1691aa23623b81dbdc9ddc8ea3bc6
font_02_sfnt_off0000ea61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA61 10404 bytes
SHA-256: 1df06ce3bfcdca106078faf5924a9deddd9054ae0ba9ab6d7d6013f9eb66b112
font_03_sfnt_off0001021e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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