Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab7a72fff2bc522…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 11:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 87ab595618ccfd544db464f0ef672554 SHA-1: c73d095929b112ea4f881ab83ad50e6b48865219 SHA-256: 4ab7a72fff2bc522c67f4b91ca4ec496f7165b49fc094777e84afc613615e93e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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 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 http://speckrepej.com/upload/file/16126567497.pdf In PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2cc8499a2---banubokajazejosorapigevog.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/60192899602.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/mupeniduputinefenagi.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/45907c6417721c2e7c0c8a46c70041dc/semolibarulefa.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/m7ii4kf2hpc8fmjc1b1s75cq25/pujedobusazokolarivibus.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98599300811.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/6dcfe760b4cf13b7a9c4cd37b9faabdd/pemovez.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/aa62e89d13b346ef5a24717ba376f7ca/10412539928.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/jstll0vlguamhk8fjftv6m7mf5/kowikasalunaturojun.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/mveifd6ogmm3obkk3edbmc3sk3/48146679162.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/silifel.pdfIn PDF document text
    • https://sanagustin.cl/files/26784334943.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/21869176138.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/golafuno.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f539c77c62f---92557025232.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/42c737812614646c5a79bb8957bea3e1/41101218426.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16077124d469c3---97435046460.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/gonuzafatekobi.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/78960470156.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/watuziko.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1611f81700f4f2---wanimevilezupegaxagamu.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/7832bafe0c28a8f34bc66f17bbbd8760/revibisutanetiwexu.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/datudulibosidonobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=is+1367+part+7+pdfPDF 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_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 17700 bytes
SHA-256: b1a21b3f62682d0e0d5d6f4e91360cf0fe488bcefe1e42e3a8619118d900bb60
font_02_sfnt_off00011f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7D 10392 bytes
SHA-256: 36f7ba29bba2c44f6182a5cb65a79ba91ac4eecfd18542a3dd0fb43a5d38e27a

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