Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e5da8f8b2d2d76…

MALICIOUS

PDF

81.3 KB Created: 2021-07-12 16:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b16779465449a067dc39df1f2c9b3b3c SHA-1: 2c192c7e54a37a0ff3d52d579bc8ecfe77e52ca2 SHA-256: 16e5da8f8b2d2d76d4d69ac59ec09683dddd9a0030eff3722ab8dcba65b5f984
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits malicious characteristics, including the presence of numerous links pointing to compromised WordPress sites, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://elbag.net/wp-content/plugins/super-forms/uploads/php/files/571f9cf881bf51b5a2594232ac0c9649/xobemikolewopovo.pdf In PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609465d52bceb---varemat.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/spvtgd2jrnidnnk2is2u2qlss2/24218302369.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/84jg4rr69ctfhd9rs0vgnntced/fipoxabi.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/c18bd726ac3d00bb014de4439f3f3096/22130993348.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16085e46287891---fobeneraluli.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/0b0449f2e499134030b550ff300d52e8/25390031699.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/12567277582.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/tetamafofovupoma.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/8s7ivglr763vkq795s6i74thf0/62859894776.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/3aipic43j7cmtousp0ebo3j9u4/sixofizuraxal.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609daa7ed1f84---danamepopogowemixufel.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/boluselogejerenuninoro.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/68mrp0bdi81l4dqt9u3p3qo6l6/zulagodevusenoragepagi.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/41776151722.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/15300061703.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/wokogemadupufoxegarasov.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16089af6164d61---miroxaxe.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/jazurovazanoxokoseneg.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c791c77940---21726570145.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdc861871c---78159543539.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/boledurewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=man+and+woman+in+bed+nakedPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/b27b55992a978872decf7a7744418ed4/dozekabizevoxilefadolufi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC25 10308 bytes
SHA-256: 50c76b8f409b1f0fb4928e2dec4e302525728ba5625bf61ce22eea020eec6c7c
font_01_sfnt_off0000f358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6A 17128 bytes
SHA-256: 8db737e327bedf6766683891108a9b652c5d5d5ba3e503bc88e42283ebae28cc

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