Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31d0d48ffde6047…

MALICIOUS

PDF

99.1 KB Created: 2021-07-19 07:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bebe007670941a8e160d1fc68e69b1c7 SHA-1: 55a8c7e4d6f47401087d9007cd038759aa005bfe SHA-256: f31d0d48ffde6047bdc713aa2c6eb3aee39a1ad30d5bc6e8788cd81682fb3789
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious intent. It contains numerous links to external resources, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://guowangcable.com/d/files/nerovelisazemof.pdf In PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/bldjn0b88qnjresrfkrlorjd4c/lasaredogewanototim.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/2btlt17tclb7t6rd97a1ooqsgc/57522620337.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/jaxusamunubutumapumomejar.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/7111843733.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/wutitik.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b746c3f084---nisosukete.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b94640dee84---kikusojajuzofolorozozofi.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/31974874498.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160989c5b51012---2770283308.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/q6u0ptfenf6hr0q1r9mpdpnrdj/zagifajugigokuxetalaf.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/zufedul.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/3ee9b788af437ce68233a2dde28f13d6/xamaduwawanapojuzemawamaz.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160911784ccb1f---13058278450.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ikpdkii9l4ia93msab8v6lfoi3/rikiwago.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/wojolenekuresasuneru.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e01bf39c2---5659779651.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747a5f853b9---pokaveradebodagetoji.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/fuwarulafolixida.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/fozibuli.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/75169293940.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8db2da756f---8714601981.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/93016176918.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/xatogixerumob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=lean+canvas+download+wordPDF 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_off000121e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E2 10284 bytes
SHA-256: 97ae52aac25085dc91cfaa30f3898523154c051d34408f047f06cb79cba16fd9
font_01_sfnt_off00013936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13936 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15148 17580 bytes
SHA-256: 1572d67c3e8d4915ae5595c1d37cb5fab1995990ddb7bc7f66c0ca45525fb840

Open this report in the interactive analyzer, or submit your own file for analysis.