Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9c294c94b96c2a…

MALICIOUS

PDF

79.4 KB Created: 2021-10-05 07:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f1b3852861f8a953a1ca3e2a41669397 SHA-1: 89ed7ebb0e3793a91779e166c5a9b325c6343f6b SHA-256: 9a9c294c94b96c2ada2ccb71b0484f5db74ceef39895ca2b7572f16b16f5d324
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, several of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and compromised CMS upload links points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=how+to+flip+a+coin PDF link annotation
    • https://topupdana.com/contents/files/58998893140.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/zupakog.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/junuzofuwagejidosu.pdfIn PDF document text
    • http://jn-zhsc.com/upload/larojurekotivexumoxeput.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614920e053f24---66774949824.pdfIn PDF document text
    • http://artio.pl/files/files/veregixumo.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/45613422853.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/xalijaw.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/zonokesaxiguta.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/52642940574.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/nupoxizuvine.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/53885278845.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/56878158831.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/mudeninidiperumam.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/88870899132.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/78752213003.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/84750328912.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/71317547252.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/34202503978.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/venibejotoganikabivew.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/wovok.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158a9803d3c1---gadarig.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/6a00cfc5676de7f47e18b9861a4caac3/sesajivetadugogenexe.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/55943563596.pdfIn PDF document text
    • https://hirurgija.me/files/geliwani.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161402d30ba45b---33078686340.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_off0000d4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E2 17100 bytes
SHA-256: e9415ce2096f84f88408bc5e233bce2856cc949871465a1ac06704e16876b752
font_01_sfnt_off00010137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001194e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194E 10148 bytes
SHA-256: 7c5bc61463a47d24c263a74eb96a728e5ac5d3bec1f6b821c9c6e6f9f29908f9

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