Malicious PDF — malware analysis report

Static analysis result for SHA-256 838def49229d5759…

MALICIOUS

PDF

85.6 KB Created: 2021-08-20 04:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5beaea2727aa5e2ea87c519bae85bf23 SHA-1: 1296a57ed291c8fd79bbd11fc6ed855d574dc735 SHA-256: 838def49229d57597808ac37974763595ae3810e4f4f8b6a559023cc6fc36396
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload storage and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links strongly suggests a phishing or SEO manipulation attack pattern.

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://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/fc0d52467e618bc02e92172c1004ff2c/xefadasonotosirofi.pdf In PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/ac9c44601e7189e47f1904be1483d0f2/vakobosulosezape.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/96446587706.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160723ef8c136d---tazozaz.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6a4b8208---6933581955.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/fokifevilesipozizepibix.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/53731191839.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/wukuluzixatusekawupuzupik.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160862b82c250f---mukiruvolesogadomovazira.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/ia1u3v5ihbpbjbfvfpmis10efl/jowapaxerunoninabu.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/bajodava.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/tubufiv.pdfIn PDF document text
    • http://cartopack.com/Images/file/pabax.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/18172327641.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/69504590391.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4d2dd3241---78214378829.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/35db9d1038275bbce786981252d2f5fc/towatijajabilokolujagefe.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/28515310306.pdfIn PDF document text
    • http://mega.kz/media/upload/files/51204463827.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/cb177baa9068f7d133da64a73973c1d1/xeladavazirawokevaj.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607537d6aa342---nutir.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/l0hneegbeof5hnismp0jdb16mt/60433043730.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/vosakolilelupefovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=billy+fuccillo+net+worth+2020PDF 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_off0000e72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF44 10700 bytes
SHA-256: eea60ccc4a687c56ff49f48647d7fc21f3b8735ef9eb6583115888e92079e438
font_02_sfnt_off000117e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E0 17580 bytes
SHA-256: db3317ec6984a233e1eb59c6dc8ad45af2a6385aff0792f9f6633df84b45f528

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