Malicious PDF — malware analysis report

Static analysis result for SHA-256 751ca1ffa6e333af…

MALICIOUS

PDF

93.5 KB Created: 2021-07-31 15:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0dd22086ab12d5fc1ab6d001c81a4f96 SHA-1: d4013ee4b7d87de0bb7f7d08a8b2e6416affa94e SHA-256: 751ca1ffa6e333af1a2c9b0f9b6577ff1bb27f538100ded366444282d1b8a95a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The heuristic 'SE_INVOICE_LURE' suggests the document's content is designed to mimic an invoice or payment request, encouraging users to click the embedded links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://crewmak.ru/uplcv?utm_term=which+is+correct+please+find+attached+or+please+see+attached PDF link annotation
    • http://kcde.kr/userfiles/file/35781394244.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/79714187641.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079eac46cee7---voduxusimilivinolotebek.pdfIn PDF document text
    • http://reinforcingourheritage.com/clients/0/08/0860c2a235168fe7e4a745c824023bdd/File/murenusarixanewu.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6ea319815---nezunoxisuzobov.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/gnb2lh068rk6ftrpkofbg6uvq2/61730122888.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/10232398758.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/vizikuvoronikemetatako.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/tosikaruz.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/77547908778.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/rapopozujujowufemefov.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d20bf3e9a9---semukuvoxuwetarupev.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/4f743cfc9c81f8acee6cf323999373d9/43803427333.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67fd55cc650140db533f6212d7639bab/31958890057.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/rovamabewuxife.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160779bc89f69b---sijexigofosivezenisipib.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/30278b181858302ea2725795b069c91e/gusizepumixijakaru.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/fepokulukoxusemuvomev.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609790cec0a98---62069960776.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc051ce9c---35786718315.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/j2imm3qsr9eam6664dpgt01fq4/34160069294.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/filimonizebe.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16079d6921404a---30749944574.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/f771fe1fe52944f77d19ddd5fa8d0523/sobawavewajenirexoxik.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/36816584161.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/mewimevud.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_off00010bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 16848 bytes
SHA-256: bba6ada0476ef126672878df9458aad19c06da45d24da4d7a2c20666e503faf0
font_01_sfnt_off00013714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F2B 10708 bytes
SHA-256: ad8eae45887ea4acd14a72ac50a5e0891beac6eaa42eb66417fd3d10e176720e

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