Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea78504fa421f408…

MALICIOUS

PDF

76.6 KB Created: 2021-09-06 13:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7b0dd2de67ce2fe8aa6bdf1158e92130 SHA-1: adf43055b586e255373db73db4bc04decb8eb69f SHA-256: ea78504fa421f4087c55c8da190d32869b3e08896df89ad9a340ea2fa7129f25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that may leverage embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/2f39cf269479eaae6c5e0283298bf5fb/bixabemizikinukelaxokeli.pdf In PDF document text
    • http://barbusci.it/maisUserFile/file/bikutuf.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/23656838547.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161353e2d23002---38950015379.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/34259766236.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdb7584835---71895431590.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7ede5b306---xagetukuba.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/cgqctep01ltuea30as97ev526e/vuxewu.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/78190027234.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097874a0883c---jesoxaji.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/wusovonapibijisirimuwilat.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2c096b9c3---37919105331.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/xukub.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/04c4ce246e4b007c05e8643e1975dffa/rujukemovuriviro.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609865a05b2da---towasi.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/25182018477.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/01v15h1fd5mnugpfcs3okam0el/giporo.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/wimam.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/82956347991.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070810145bc0---gagodubirotalegilose.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/29363373706.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/45220171999.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f04eb830e1---wizamemesetorakigogib.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/remibulitamelanir.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/zowezuwenajitokugaxijesa.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/subijodakozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=altivar+630+profibus+manualPDF 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_off0000c297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC297 18724 bytes
SHA-256: 75001177e63240f0dfe68329d9d4ea42cf0685a71391af86566cf47af07d805f
font_01_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 11136 bytes
SHA-256: 316b12217e5ab6c73c1a4dbb74d61d6a39ae4a2c2451086f2331c55f589f1835
font_02_sfnt_off00010d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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