Malicious PDF — malware analysis report

Static analysis result for SHA-256 101d3162180eea31…

MALICIOUS

PDF

101.9 KB Created: 2021-08-12 18:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 934042e4a2000ca8df93147876a6b2c7 SHA-1: 13e74516bd409b082c94e9266b029fbe44f17551 SHA-256: 101d3162180eea318e28b2da5ed37d48519c2c0010ebb75829c7b818b017996b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised WordPress sites and appear to be part of a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://smidgel.ru/uplcv?utm_term=nescaf%C3%A9+dolce+gusto+oblo+manual+white+by+krups PDF link annotation
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079fef86a8c9---93440836436.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/06-19-02-40-58-66.pdfIn PDF document text
    • https://petek.biz/resimler/files/2096326445.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/87859169626.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/risobep.pdfIn PDF document text
    • http://teresachild.com/upload/files/lomizuxerufefubavaji.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e66f4b3a8d---sepunejasotub.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610886f4d4ed8---71496345186.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0d84e8f7d---39887165845.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/bebuvipezelumimuzew.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b809e4ae8287c86959d3f87436317ca3/pokikesorewetalupazu.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/12677589465.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098aa56b854b---47012398374.pdfIn PDF document text
    • https://hirurgija.me//files/83997821985.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/68567688307.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/2neenamqibtrvpkp51r31bprt2/tegov.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202143015711128.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/21686873702.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071834c5b898---perawitoputorajikifawa.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b730d43c325---magefavanowabom.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/f7c67bbcc1c5a8d1c386f2a1d304a601/jogotexovinoka.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/gejabezevufonarov.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b98b330a345---13248016565.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2eae104ba---vakumofonalamoxuwa.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_off000124d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE7 11728 bytes
SHA-256: 261c19436da2ee6987e1753a2d280558f513f6c3cf020233c22d9a29bcbce893
font_02_sfnt_off00015805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15805 18052 bytes
SHA-256: 38c4a5f139ec3fcae92ce9a21d69bb3347868c785f64745593c0489f9bb7835f

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