Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc0e2c19e38d1ec…

MALICIOUS

PDF

85.2 KB Created: 2021-09-15 19:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5ad1e0fe7d6d1abf4377c4fe78895662 SHA-1: 544426082dad79c785c6748d2815bc89f4b65ef2 SHA-256: cdc0e2c19e38d1ec9052bbf5939eec0318f0039cb07cb7024a8366a7a552fad5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous links pointing to PDFs hosted on compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://harrisitalia.it/uploads/file/kikugejewivedixu.pdf In PDF document text
    • http://dzirerealtors.com/uploads/vijitegotek.pdfIn PDF document text
    • http://teraval.cz/res/file/62083610644.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/96141180107.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/fomifumululupivumesizin.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/48878980400.pdfIn PDF document text
    • http://dentherapia.hu/files/file/nakovufusenumuzozodag.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/95807683529.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/sokaw.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/18939446357.pdfIn PDF document text
    • https://lorus.rs/files/88756144546.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/86011399113.pdfIn PDF document text
    • http://osayit.com/images/file/majurulizalolupegexalobiv.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/punenikowafugutiwapa.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141133e99cf2---texobu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614118e25255c---falamujixikenebivexuv.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1858bd770---98176213299.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/wutijatulopusobu.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/30882604259.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/40331862724.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/38091035479.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/93457046688.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a14d1ee2d---93707397725.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/8016422719.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/36879339484.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/59620121783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fondos+pantallas+androidPDF 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_off0000e7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 10228 bytes
SHA-256: ff8687fcce1d408c01a8f7de5edae225c00e6cca922f42afc52bc1a9e1060365
font_01_sfnt_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 18808 bytes
SHA-256: 3ad410cd94c46ce2d578fdff837b85c6d79d350a2f56e510eb8d760a907792e3
font_02_sfnt_off00012f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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