Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e581cd7240d0f9f…

MALICIOUS

PDF

99.9 KB Created: 2021-07-25 20:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4370653046ceda68e517ee6c1958dbeb SHA-1: 2debc4fae8d80ad1711b3d462ac5223a143af0c7 SHA-256: 3e581cd7240d0f9f7bad6c9174a52df257f6ad51195cefb6f52183d257ea6290
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be compromised WordPress installations. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

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 http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c554fdd419---soxugepemuxexaz.pdf In PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/78878741510.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/094006b3a7a64e5c141b3a526b5ec246/fubepobarisipog.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c22314b05---mojiluxavukoj.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210718_020419.pdfIn PDF document text
    • http://dentherapia.hu/files/file/70077183590.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/84ca27bbc764b6e9d495aec9d7bca8b8/76764007535.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/25130076755.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/977ec298e0bf1ca147764340dfdab2f4/somisifopod.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16086f1ca18c21---jomosezuxidev.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/fitudowulalamabozaxi.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/2c2d06cf6b66008df7398129f0c41c78/budiposoraperakik.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/9771062957.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/49455211161.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/82318368927.pdfIn PDF document text
    • https://kopari.hu/files/file/dunasufozeraw.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cc9f60145---xeratuniloju.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/33c3b62cec6d675811407541b32d4f35/pipajaj.pdfIn PDF document text
    • https://partnermind.cz/images/files/62031163496.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/htkarlen305crd86otm8eqiku3/4677548685.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/36097142747.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/17580733941.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad88b891f35---mejelagoxagisomukobile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=salesforce+admin+certification+exam+questionsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF2 2896 bytes
SHA-256: 80419bdfc2b5431b4f88535d0e307b1c9c77bca774962c2eac826abba3d80afa
font_01_sfnt_off00010915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10915 11060 bytes
SHA-256: e74370cfa1253088827305e2b1c5ee5bdeaccef905e119e1e9c97d14c7d599e7
font_02_sfnt_off00012296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12296 18192 bytes
SHA-256: f3366b5c4912b150b2dda0abafe8de0d4887f83519b2233b51dfa6ee368ecc41
font_03_sfnt_off0001528c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528C 16392 bytes
SHA-256: 439f91fc52918ec11de7c10fc66f42d556e3ca0baf24f0cec7590a9fe4e8f18d
font_04_sfnt_off000168b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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