Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5d510038778d76…

MALICIOUS

PDF

94.7 KB Created: 2021-07-08 06:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a03ce7cbc825300683bd9487784d2700 SHA-1: eff340bf9f735de182760388436f2c2475eb9447 SHA-256: ec5d510038778d76bd9812affbedf490f1deb14aee07eee93603262c1c7e58bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS upload storage or disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a spearphishing attachment, designed to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://synerhu.ru/uplcv?utm_term=what+type+of+diploma+is+a+high+school+diploma
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/57380199430.pdf
    • http://akicgiyim.com/userfiles/file/sosufijadexuvej.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b50bf2f7ae---45239220076.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b54d645f8e---6828637123.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ebc846b5d---29949594054.pdf
    • http://euro-ex.com/wireborowib.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c1413a9c6f4eafa55982ae7237012cd4/40282489083.pdf
    • http://cuatro-pr.org/sites/default/files/file/vebarusogegule.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b5135393fa7---76848138367.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/57523114586.pdf
    • https://cakenflowersonline.com/userfiles/file/rakagadib.pdf
    • https://abofahed.com/userfiles/file/2577565347.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608c78ea97305---dobasumejinugukagalule.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c7567eae64a---nebugi.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/109a7b71b349accf33c3b2867d2fd0a2/birufojemarumofedise.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/v01vd2ng8coacr3ri6jlaneko7/laxilekegugezuxajiriwa.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4cad25f80---mazifosufozusujuwujapizox.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/qspsmit9468k7hhr5o00qd7fah/golusazibirasotezaf.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ce14dbeb97244d3e77e4d0405bb31104/gexizitobotitebirapijota.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df38770696---96284527494.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ae62bf8a91c62618c56a2ef2d219913e/jujezagovirorofukezilaz.pdf
    • https://walkandsmile.com/userfiles/file/85858882109.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bac0aa52d---92580571659.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a7a5d0348fd733970420edab55b388b9/75051218184.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111DC 16792 bytes
font_01_sfnt_off000129f3.bin
7644467b1355e295b91d5fe410bdd2c5cadff5a267fc593200cb5d3be798d001		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129F3 10972 bytes
font_02_sfnt_off0001433d.bin
30912cddcb5e3c9eda00554f581f5b25c62725aca393f782efc1725638d1e64f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1433D 16292 bytes

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