Malicious PDF — malware analysis report

Static analysis result for SHA-256 93af25c17883fc55…

MALICIOUS

PDF

83.7 KB Created: 2021-06-29 01:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3767375facea8f19e3d9d2fc23998b5f SHA-1: df40eb0e811f21284a6fc1e89fbca462f56b2b22 SHA-256: 93af25c17883fc55866ddb75f1d6527d71e0f22d0beaba6a8b9c88249d02d576
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm pointing to compromised websites. The PDF contains numerous embedded URLs, many of which are hosted on potentially compromised CMS upload directories, suggesting an attempt to distribute further malicious content or phish users. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/11115fe57105fd78fc1cc775a44b1de5/vafuvilalivuro.pdf
    • http://poorclarescork.ie/images/81982900500.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a72b1756---jezakejuramevolelakusud.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/e89ouiu9cbud6c7egf3gfk2p90/guwemod.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ac5fa7e69---xufamezimozosapo.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb48882783---jodepujemu.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a9109ab82---gutasabafej.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609868ce14431---57121349270.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/7742570a284f3988fc936db7243c9b95/talomudefezanoli.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/64dp6eno5452mip7o2n086ivhl/50832835723.pdf
    • http://www.bash.cl/media/file/72018068790.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bf6038dfa---majoz.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/f779c1qvh9fovnc179crp4aj3j/kazigemosijija.pdf
    • http://leguido.net/files/linej.pdf
    • http://meruzhankhachatryan.com/app/webroot/files/file/12818977338.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160861e99f35ad---mugeme.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5c6e259e8d03f7a7fccd61b201948b17/zadime.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec81663c79---57359317736.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/2cde72663f0fc23353d1dc0172df1531/79798462990.pdf
    • http://ixtvs.de/_upload_bilder/_filemanager/file/41342303407.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=letter+e+art+and+craft+for+preschoolers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e70a.bin
b940a1e4df621af02b2c099c8881b8ae56d210bf752b01250df581b4327f236f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 16436 bytes
font_01_sfnt_off000111b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111B4 16792 bytes
font_02_sfnt_off000129cb.bin
33735dea44d6e2808af3d975b3185d3fc40f54ec5fba76133497d115879d1358
pdf-font-stream PDF embedded font (sfnt) at offset 0x129CB 10584 bytes