Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79548370915122b…

MALICIOUS

PDF

87.7 KB Created: 2021-09-14 04:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 36d4987d605b5eb02488d9a3179c4cf7 SHA-1: 068e7616099e162890f19dec0c3a9238f218b4d5 SHA-256: c79548370915122bc607c407ebd96c17a29bfd21e20da5ce9147dd455038aaf9
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates a likely spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://ty-int.com/files/files/60721184121.pdf In PDF document text
    • http://unityproductions.com/upload/files/nejojomolowi.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/xopitema.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/32648731268.pdfIn PDF document text
    • http://davobio.com/upload/files/60720296219.pdfIn PDF document text
    • http://ktcz.eu/files/files/fevudokaroweg.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/pm1uleoie0luolbig2tmfbqku0/devizeredewigubopajepofi.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/xevuzujegujenusaranifoxon.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613977e3e7a1c---nodajowipuka.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/30672379647.pdfIn PDF document text
    • http://ranchobg.com/img/file/60420027636.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/73073422007.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/74058777387.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348d5376f4f---95140398894.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/lubula.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/68e1hdrb1o48b4m4883cactr33/60098842128.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/bebafimefiwen.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd29626b81---88323910468.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/pesixosatupajulifivib.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/99112154638.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/815a89e4129a28f7ab8f76db0b4172c1/sibotesanojebutavotakij.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/71411712291.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/42383984319.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/sozozawi.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/varapufatefenupibawu.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/38126246456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=tamilyogi+isaimini+2021PDF 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_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 10492 bytes
SHA-256: b60538684cf423f30919c855a2503f7d31c8c6d5a909b17f424033e4323a723a
font_01_sfnt_off00010800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10800 18796 bytes
SHA-256: 75e79dc05981d5f387fa494f4944e521ed7adf44ca2c716ba666789be7318438
font_02_sfnt_off000138fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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