Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a007d4c945f32b…

MALICIOUS

PDF

84.7 KB Created: 2021-07-08 04:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bfefb990b3a660f1699f014dfe49ef83 SHA-1: f0d0ae482a06f7cd0804e8b7feaf954212e76762 SHA-256: 59a007d4c945f32b06e5ea78508196c3e2f3759c3176068de5ffbb6b4d015945
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a968b197ece---vasaw.pdf In PDF document text
    • http://firewheels.pe/userfiles/file/41623719230.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210618071224433.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1bac09af9---fijilajunana.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/d76d9febd4049269bc39f253970b4983/74304882938.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4ed0a4c85---ritujox.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/lofarasodifa.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c35432377---dilused.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/gebuba.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/pobesiluwokip.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/dopakobariwadipe.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160863d640058b---93900419566.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb912dd691---72224664966.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/kekirenibefurepalib.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/jaludurumikuvog.pdfIn PDF document text
    • https://andana.us/files/files/19750328413.pdfIn PDF document text
    • http://cecev.com/stockages/files/69101716868.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd7e158932---nenug.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/fkeuajndt2p2qop4paa2pa8on4/89950797851.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/gegapibavaxatupemik.pdfIn PDF document text
    • http://apvn.info/userfiles/file/nekawufokesedevurolebaru.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/46509658778.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/pegisagovukelanimo.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9fa3082c8---xamalep.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/n01d1v2hscne63lor9kc397p0u/70470379387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=physical+signs+of+third+eye+openingPDF link annotation
    • https://youtu.be/7Qqq14VuJ_AIn 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_off0000e90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001011f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011F 16512 bytes
SHA-256: 9d6f139408ece9042e715c5aa3b127e6014df59ec88039cb87d324953f574233
font_02_sfnt_off00012be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE1 11012 bytes
SHA-256: 99f6716d943c7c9e5ac8ea157a9bd2a3c32ff87cb327a2253c99ed1576d32e16