Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd6a7dc956d7079…

MALICIOUS

PDF

98.5 KB Created: 2021-07-02 04:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a15cb845fedde180992347158e298c97 SHA-1: 293650f885d91f7af2726235e53c549c5f48e4c2 SHA-256: 5fd6a7dc956d707979b028d8fd78709c3ef00bb5a600e0515d0e90b6c6c20721
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites. The primary purpose seems to be directing users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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=untouched+meaning+in+english PDF link annotation
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf160d829c---xumamujimixeluwifopad.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01e5f01dd---17342611603.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/85764495881.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc17f16f2c---16745657641.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/de39d0b065a889e7dda458b04f2a61bc/jarisixun.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fe49d9772---86169457599.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c096d2ef54---74739999775.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04fc0612e3---kekusutufepozagi.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/ludizi.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/qecf0ml2i9a2ic4mrfklvfhhho/68744043052.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/306fb4e59a54d5d9c34b4b862083c4de/luviline.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b889f072b15---pedikajetoxuzukofosube.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/20748791260.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/2100962511.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/96be8ddf6b26eea923c2b1978ab75cef/35191897616.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/53514591406.pdfIn PDF document text
    • http://jaatkinson.com/userimages/milaf.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/67534064712.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/11041159755.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/verezinobigijig.pdfIn PDF document text
    • https://33mobility.net/uploads/files/buvaman.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4fb67e9ab---visizuwibij.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/kogexonedadegososo.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d893320f44---refulupedonuzawutiwiva.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000146f8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x146F8 19056 bytes
SHA-256: fbd19775f9b644e5b9d884184af6ad74de477aa9b4750472a4279dbb90d0ecdb
font_00_sfnt_off0000d86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 10824 bytes
SHA-256: 5ed4f5038fb41108f6ca8c2b2888c2a8a4feac8b48174e62173d1a74fe58921d
font_02_sfnt_off0001090b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090B 25732 bytes
SHA-256: aaa3d0fc7bfdd6d7bd6b852b01c2807af96bfa046b6af5f4179b929c651de513
font_04_sfnt_off0001669a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1669A 5396 bytes
SHA-256: 611f3e78109eeec1395f6584eb0074d4d5001ac2fca406dc46cfb19d19234949

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