Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d38a0e4b33b9cc…

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 05:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f6bd6cf3b63f68d0921b1e7775c51e65 SHA-1: 05ea4282e3483f8074c4c990d5c2d981ed2909e0 SHA-256: 15d38a0e4b33b9cc3b15821fca42f7bbf991af11c763c9069d54e7af79fa8942
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted from this sample, but the presence of external URIs and the link farm structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drafthe.ru/uplcv?utm_term=how+to+grow+bigger+artichokes PDF link annotation
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/4636716820eeaae5e70957acd16c37ba/16607150284.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/19407762228.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/jatuwifusotiketeku.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071c492edb66---videxej.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/91845274556.pdfIn PDF document text
    • http://rcot.by/pics/files/medinurib.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/36947288450.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/68737488827.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/82d31bbcf04f425a2f96a663ea925eae/26850047869.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/juburaxudapi.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160722117bb282---mufabesonojobaja.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/vusidefugodonebig.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/kedugi.pdfIn PDF document text
    • http://wamer.org/userfiles/file/juxojijetawimadevijupa.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/lewujusoxigomudumiwadugu.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/52754997188.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/cacl4cjg432l6mh8sdjsd16o1h/17545049613.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/bewew.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/7uqkurt39d9m7gmsl2j36c95b3/6752340905.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/758be4c9042bd8c6a9d2acfa1d40ca71/74770837851.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/10020875512.pdfIn PDF document text
    • http://gerocuki.hu/user/file/96517022160.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/xilubaboteje.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_off0000d54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54A 17532 bytes
SHA-256: 892cd93d591d58653d1f3003c68a5a662834bf84df29c914c560d602a0521bcb
font_01_sfnt_off000102b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B2 10668 bytes
SHA-256: f5f055458514e668cdd85166256c42b5e8562bdd15223ec7b34bc3953e4c23e8
font_02_sfnt_off00011b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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