Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d1d5f45ed9d5e9…

MALICIOUS

PDF

86.8 KB Created: 2021-08-19 18:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38954c2ae30ef5c020dc5f50179aeae8 SHA-1: 8f4aace6c5cdd652bbcaf4471f0c60f3d65c920f SHA-256: c7d1d5f45ed9d5e98bc4dc42f7b222ea567bb9f44632ca4630c0f7c45988208d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/fa6q2fk58ro1p0u47vt3pd1bp6/ludixuni.pdf In PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaff779257---surotagazedatidutarif.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b696aa3b88c---55357929861.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/u014s97bmt121t736et5jjrf15/25527672594.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f47e9840604---66951135743.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/83618679702.pdfIn PDF document text
    • http://12shio5.com/contents//files/risinasemaxusaxiw.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2ed48bf80---lusomewamofizufuxinevu.pdfIn PDF document text
    • http://vswet.ru/f/gomogo.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/pogavi.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/8216893654.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/di9rq9nic1sv705i70vmua7424/51776904708.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/diwuxasu.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd46b190ae---pofisutawavesuwamixalo.pdfIn PDF document text
    • http://soflacops.com/clients/83266/File/nidomizedijeselugu.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/fea6eja09a7tfen0gm33oqep4l/dudabikefekakadixiti.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/warovi.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/c07b09bcfb388e5d365c203426030a5e/fokes.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/zilurifirujip.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/94066206101.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/44241676116.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46239f2926---64375283789.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8a3be52f0---sagubowabe.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/017f16773361e3188b350d303c886f85/75481344382.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d74a31012---28676141334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=bts+bon+voyage+season+1+ep+4+eng+sub+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_006_off000128d1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x128D1 20932 bytes
SHA-256: 043d6c02c0ef3b4bdb38c675cd4ca826da7cf365d4a6cf1c5d99b8fbed777eff
font_00_sfnt_off0000c866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC866 11064 bytes
SHA-256: 1054f56970855335c9c8b69823fdbacd9f43254c7e7a525fa873bf2d02c3ed4f
font_01_sfnt_off0000e221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE221 18264 bytes
SHA-256: 81fecfd035404728e3e467d41c644306b678c3a07c1423bf84a0757afc864b44
font_02_sfnt_off000110c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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