Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d920a929522cf70…

MALICIOUS

PDF

86.1 KB Created: 2021-07-30 13:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d721378ad337466122253d323c93d746 SHA-1: 6a15f00f4fa40dd6a96c775979cf7cca3b5e7f42 SHA-256: 1d920a929522cf705d6a250bad1fcebf2921a26f296a227fe6f566fdf323416d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://catamma.ru/uplcv?utm_term=is+3200mhz+ram+good+for+ryzen PDF link annotation
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607375b410f32---tazogava.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609842d1588d8---tirukodemikakobi.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/8nmrdc0c5jh5elulaa8ajvg10m/52058782518.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9323e11525---laxuwinixoxitutoforarovu.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/35058756499.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/2cf95415919a26c6e01106537f97b88e/sopoxomu.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/86892823298.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072911b94727---belinajum.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160908c1caacdd---69266456368.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/kipanipidibonudorebozevug.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/af6543430becd2dc7c119928dab0eb8b/90422601585.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/zonawi.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7nedt0lk1l26mii6tfr21r5f13/didodi.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/motadasexarewafotamo.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/3662374641.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/76470073111.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/fawufinewut.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9cc1caa3a804582d0906109a600b580a/91292075635.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/c825f91b12991eb542f607e277504fa1/3837244870.pdfIn PDF document text
    • http://mega.kz/media/upload/files/60893581685.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/tisaludexuja.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/jlk28o38r7shs77360tqkvf60l/monimexajoja.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_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C0 11104 bytes
SHA-256: 07d55a38cf161c42ecb7fcb5b93c76bc04a6f9f887dede6f092f98d864231172
font_02_sfnt_off00011f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5A 16844 bytes
SHA-256: d745996e3b7613c169ce8ac24b78840634d7969659c4866b2ba20b28c9d6f0ef

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