Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff3b686a9b8cd4e…

MALICIOUS

PDF

87.3 KB Created: 2021-07-28 11:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d74ff3c4e91c6aa4e516b60cdc8b9ac SHA-1: 4ed859e5f19bfa846654107b486608e0c6a6191d SHA-256: 5ff3b686a9b8cd4e08cf3f2636fcab975596885d49d2eda73713d13676a60a63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to download content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/82a33c136e198ddc9588c2da64faef32/siratotamikudozinegeku.pdf In PDF document text
    • http://derma-dts.de/files/file/fuxowonevogizuwaleb.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607805b139a07---6046901596.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/xodopobim.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/gosakubufaseres.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ace63c84e5b6159fcd0a47e84c3dca94/10583242526.pdfIn PDF document text
    • http://farmina.ru/uploads/files/41199884891.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/sugupuf.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160fce1f1c1cc2---52757618776.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/12257112605.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/51203cb099c4f462c4c2a16d519e413a/93929666924.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/7960380552.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/mowabapudadakusugajazeta.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/9911340479.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073af521c0d5---jupudamodedewimevamutexe.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160db0080c5dfc---11397289351.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/3f832e9f1ce73617cb2bd63a4e0f83a5/26918430485.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/jotakipobonomigizo.pdfIn PDF document text
    • http://ysenb.kr/board/file/editor/file/24570169071.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e0168f36e---82170866088.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/tadavonedi.pdfIn PDF document text
    • https://susta.vn/userfiles/file/51432071197.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8608cb983---68311115467.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202107/file/210728023050521501mkk7hl0kpbec.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=warship+attack+3d+mod+apk+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00012e8e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12E8E 19168 bytes
SHA-256: 18e2e9b1d1de0dab4667568834e34dc9d8fb62bab1b085154675df15257f2d7b
font_00_sfnt_off0000d055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 16764 bytes
SHA-256: cc735595d5198b4d80aeaa2c035a24d9fd8bf181568d6142211d4b4963ca33ea
font_02_sfnt_off00011459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 11228 bytes
SHA-256: 5ad62d6f5a00db2b3b6b5a26ecf306716db837ae7a921ab3461de867f68f9422

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