Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4dcef16b2e9616…

MALICIOUS

PDF

77.8 KB Created: 2021-09-20 16:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4eca364a205217d3443b0bb1ebf128a1 SHA-1: 441b42d156a680b180322f4e9bc26cd4d777f066 SHA-256: 2f4dcef16b2e9616eac84b60b7480dbb3c74db428c61f2f6cdd36c460e9c5b7d
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://profession-your-dr.com/uploads/files/202109101246038019.pdf In PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/94331868845.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/todinovugabuganaxawafa.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/ridemefele.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ivv71blrlfp8lkerk0objhlnc0/nanajez.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/kowofofixazipim.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/34580516595.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/8270722746.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613171086625e---83537793266.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/ropoxinujugavobov.pdfIn PDF document text
    • http://teifsepahan.com/files/file/puvabadatiweletazew.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cdb5d60cc---35942647406.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/3830014519.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/bunepumuku.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/54274710897.pdfIn PDF document text
    • http://ailizia.com/userfiles/13429631921.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/wuvefawiludurug.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/97225601787.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/2126554323.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/4525507306.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7f133a9b1---99462391143.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/sawuvegegi.pdfIn PDF document text
    • http://trinitysportsandleisure.ie/userfiles/file/74221851319.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/19061655718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pok%C3%A9mon+ultra+sun+and+ultra+moon+romPDF 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_off0000c8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A9 10532 bytes
SHA-256: 61b1f4c12b9c353cc09683b56ed1e547577f8a4c050943723bd9f5414bdeca34
font_01_sfnt_off0000e0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B4 18056 bytes
SHA-256: 545f335cd9b77de8b0e9c09d9ebf1155f510e4364d24abfbf486942a19a4cbb7
font_02_sfnt_off00010f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1