Malicious PDF — malware analysis report

Static analysis result for SHA-256 3643996a301dbeda…

MALICIOUS

PDF

68.5 KB Created: 2021-09-28 19:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ada03614ca21c49290609f67f2800f2 SHA-1: 976f7a544d43f51cfb956577b6ee83da2ecd0943 SHA-256: 3643996a301dbeda70195b0c9c2524070d9b1334e42197c847aa9f0152129649
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, including one that appears to be a phishing lure for 'free Fortnite codes'. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous links to potentially compromised CMS upload directories suggests a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://huntic.ru/uplcv?utm_term=free+fortnite+code+generator PDF link annotation
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151b4352ebf7---lumuwogulatarolapovu.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/0cd8832e0572f37ce2185bdd40f20db7/jonij.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/62870578260.pdfIn PDF document text
    • https://aurorahoian.com/app/webroot/upload/files/dokufepetipisewegajatob.pdfIn PDF document text
    • https://architektor.ru/uploads/file/91292125409.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/xurelatukagiwuguw.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/dololi.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/44659487094.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/lujubafenexopo.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/38561545122.pdfIn PDF document text
    • http://strap.sk/uploads/file/76186817032.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/86535649523.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/rumapawotobumu.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/60004045921.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/lufinox.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/vutuwokafirabegi.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a38f221e5a637e061161cc40024deb0e/61168430582.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/31559999453.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/88362513495.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/pelaz.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad6532e124---68477440237.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/lobasoduzesaxo.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/72611160453.pdfIn PDF document text
    • http://secoinblock.com/upload/files/71789900763.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_off0000af77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF77 10416 bytes
SHA-256: 63235409bc773b5cb3f2241f33ecbff1d1be58d345c8129c53b374b9f7d2736b
font_01_sfnt_off0000c6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EE 14900 bytes
SHA-256: 633145fc41ad49755ae2d1997ef22560b74f90512f544ecb0e4c52a824ed7457
font_02_sfnt_off0000ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1