Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e9829b46a48fb17…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 21:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fd5b48916f787ae827401656f4068b65 SHA-1: a90ed265eff4932aca7d8a93d6033aa37652a460 SHA-256: 7e9829b46a48fb17997069cb2bd5e2a0ef0de93281e0f350b8c809113c92acd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=red+under+eyes PDF link annotation
    • https://safetyhanoi.com/userfiles/file/71713338155.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/b600an923nlko3cjbu5auctbd6/folimu.pdfIn PDF document text
    • http://clerus.hu/files/file/lojeje.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/99920476016.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/88198332676.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163090719831.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1c9040810---17468394156.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/39a0ebfcb49e31d4084681ddaf0e2d07/14873952790.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/pinenulekadonunovi.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/25e1bdd40007f21fc43be54a9944f879/kogerugozasurubizole.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161336b1209a8f---xedazekejuguve.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/15468730809.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-9/20210909151805201208.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/dfdf68f79c13ff7f34922b902a47cdb1/kelatixedu.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/85b760e07797cd261fe0ad41d834d746/sejatafebakevu.pdfIn PDF document text
    • http://tchid.net/userfiles/file/xugebirepopefajoxufixexu.pdfIn PDF document text
    • https://sim2007.com/files/46528598987.pdfIn PDF document text
    • https://dukupahit.com/contents/files/63237117083.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/62114343887.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/59370459216.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/xenufoxuf.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/69165426078.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/6958869994.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_off0000df39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 17004 bytes
SHA-256: 9cdf117e0533812b125628e3a16c94376d7467d531123ace674a37f3bd4bf68f
font_02_sfnt_off00012351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12351 9984 bytes
SHA-256: 399712ea33a816a3950134fc8513ec76c75c3fa883f5d7c050e45230054e5919

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