Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd473d678181843…

MALICIOUS

PDF

117.8 KB Created: 2021-06-09 19:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b8abfe9aad6abd1fa435d35e46b8967c SHA-1: 335c56c2055f81a435fcea58f799c0ec98f0d1d2 SHA-256: 1fd473d67818184348ac9763e907a60609a37b33144f7411fcb563d8fbf93359
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, and one external URI that appears to be a search result lure. The document body is heavily obfuscated and unreadable, but the presence of external links suggests the file is designed to redirect users to potentially harmful websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://drafthe.ru/uplcv?utm_term=maria+montessori+her+life+and+work+pdf PDF link annotation
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26dacc58dc---23538827129.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7c538fc335b5bb2139ee814c053ed257/62673021575.pdfIn PDF document text
    • https://promise-land.com/upload/file/palapubupofijeledelo.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16091218a3f2e1---xowakudolamavoxazos.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/pjig7rmdn10la17tvqtpc47shp/boxeranamewemikalefizoga.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/lifarixobesuzux.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725e73f08d9---zenuxavanuxewigorelovu.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/v8q6evs1l7d46a6fu8o9f1bih4/8116237067.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acad94c2dff---boxutotofevanipubija.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/1cc1606449a6c1daf92570cd72fd8f60/kudegedu.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/5664a9443450977d122a87d931818bec/wepupubomumed.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a486bb13---wekaluvisibobe.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67fd55cc650140db533f6212d7639bab/31958890057.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8c1365e81---nudaleboradukavujugu.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a7e270687f47319194d3cc9a5862b16b/minemoxujoxozave.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001812c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1812C 4260 bytes
SHA-256: 9736d9791ff0b5adb562ea74e829bd06f7107c892349f325db7de28f061e019f
font_01_sfnt_off00019043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19043 5440 bytes
SHA-256: afe3a4fa7224038daeba0343ee73006b97292ea56ef76e2f6f4bbc4455bf19e6
font_02_sfnt_off0001a2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2BA 12132 bytes
SHA-256: 4396fd3bcfb2877cc26136503d2a00b49597e768c913954ad03d80a101b25303

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