Malicious PDF — malware analysis report

Static analysis result for SHA-256 af90a338ace20434…

MALICIOUS

PDF

95.1 KB Created: 2021-09-07 08:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 161d11af09673931aac69138ad1bf2c2 SHA-1: 25aced432e494163820db7eaca19ef16a9f5a12c SHA-256: af90a338ace20434291061e19741bc2244994b7ad579a952f88b9e30927bb892
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable domains, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and contains no readable text, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://prospekt-rostov.ru/ckfinder/userfiles/files/ketabawezumonevebarigad.pdf In PDF document text
    • http://stroisvias.ru/userfiles/file/67722831858.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/f489750cf8757ce7b7d706f020a1f09f/rozexuratinokobum.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090107252783.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a339ddde---bobaxoligezuzo.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/26194476890.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/wuxalufed.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/79835147962.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/tusegafomodas.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/kusiwitalurejelinodubu.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/bfboujjsa3ibhfrb7t2im0ac22ejsdk1/zalik.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/xopusekamadogusafaxu.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/5636084566.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a3d936665---zegexi.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8b5139c5f---59403331335.pdfIn PDF document text
    • http://peoplefineart.com/assets/202108/files/20210830183655787985.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/48791960356.pdfIn PDF document text
    • https://shiokuda2.com/contents//files/44130099286.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/kkhooqu34hlqldn5rr3moav0oo/gurovobo.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/vukebi.pdfIn PDF document text
    • http://upbfassadenbau.com/upload/file/pigudato.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/magopas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+configure+mikrotik+router+for+internet+pdfPDF 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_off0000e6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 24428 bytes
SHA-256: e095b472f8cf8db18054b1b4d86d930ca99ff32605b2b7a075f090613297aeed
font_01_sfnt_off00012581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12581 10856 bytes
SHA-256: 2b34439cbf108850aab6ba4ba1dc0c322ab7e53b5a3532352ffe2073bf4da19e
font_02_sfnt_off00013e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5D 16560 bytes
SHA-256: f5ceee5e250ef6cf5e50d2e6567e2bf524151d6248953c20fabac3e10ce94760
font_03_sfnt_off000155ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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