Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb08dac42047062f…

MALICIOUS

PDF

90.9 KB Created: 2021-07-14 03:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 881ad3ca629dcc4d40d95a7991ed84c3 SHA-1: f536474b8abd64e0f7cc41496cf47a571db5c772 SHA-256: bb08dac42047062f7b5cbc4e7f40fb1ee60887ed32ce702f976593b8360d75fe
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable domains, likely for phishing or malware distribution. The presence of numerous unknown URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/7f2aa3d403dea94aad52722ce92ca515/xikerubopaduk.pdf In PDF document text
    • http://alimentosldm.com/userfiles/file/42236834014.pdfIn PDF document text
    • http://samtle.net/ckupload/files/58297334551.pdfIn PDF document text
    • https://viettrungson.com/media//Files/pawerarukus.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/d2d69957f14f79ebf4e7a21a539db562/70764945458.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/15abimnapi9f8cpvua2gg5ehcp/molikebatilusemiwu.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021052205465189.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608564aba05e8---38453953452.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210708_B5DE0340E0BB1099.pdfIn PDF document text
    • http://fitviewer.de/files/file/72208501652.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bd266f90a---3843114439.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/pilamav.pdfIn PDF document text
    • https://irantruck.ir/data/file/jelawimogutixejara.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/3cf65b54a703884ad187c4e048c97fa7/41715730821.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdcb456c0d---vujolutotalifawimitasez.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cfc46ed0b---kozop.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b53b43723---xufog.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/fjp30p74lqstv6p80uj9ravjvn/moxumotetedasigeduwi.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aebbcab7074---posasasugurivabimomu.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883c6b0064f---36789957890.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/53183531730.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609440f28b426---63798676397.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/pumugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=easy+nibbles+with+drinksPDF 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_off0000ff96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A8 18240 bytes
SHA-256: eb285ecde3bd82229a67485d6759eccd4782af26f79c16e96e571efc149bdef4
font_02_sfnt_off000145de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DE 10640 bytes
SHA-256: 6198bc2b7b9ba87c9f4b4394b11a221f1815e3c1ff8999b1f7bd33657f8ef059

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