Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c799ae41dd89cf…

MALICIOUS

PDF

89.3 KB Created: 2021-09-01 12:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d5a2123b3e19c7213902039aea5edbb9 SHA-1: cdc5afac35c79e406047c01bb50427dcb8b94bd9 SHA-256: a2c799ae41dd89cfd9e50a79cd086ee8f138a9dc922cabad05c044c93f5d467c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, suggesting an attempt to distribute malicious content or engage in phishing. The presence of multiple distinct hosts and a high number of links indicates a coordinated effort to obscure the true destination or purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://andrelandberg.com/userfiles/file/tujimikudo.pdf In PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e861ef44e0852cc4f77e95018d461b24/54826255275.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/manopatifesimaton.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/85ccb89eda3c93342d49f4d57e618aaf/39919866412.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/7d3481bc30d96c055c3b5df01466709b/padokotijamuzexafapu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f48a036f8---90198568786.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/4b9be89814bc09b51a0726b9604445e2/luwawuw.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/zubuwomonusatimegitizira.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/patesufanigotizizediminuz.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/99141966856.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106080902305674.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/vunigufutokozaradewa.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/40567592872.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/42337402689.pdfIn PDF document text
    • http://cke.hk/userfiles/dogofefal.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/gavesajomaxemimujel.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/juviwewivesopufomu.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de6823c1855---boliw.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c751403d21ea41d0ea074ed4ffd768bb/muvizesexorogimimab.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/v57v4jcqirakj14u6f2hvc7ck3/rupopoxomefofazan.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/lirarujoxebopipu.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ifbur0mslooch091ttm6jdkpd2/43447770254.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/32208376154.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f828c8b34---71148991038.pdfIn PDF document text
    • http://sun-tes.ru/files/file/benaturatusezupuzute.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/gomof.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/74949651377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=photo+editor+snapseed+onlinePDF 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_off0000f793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF793 10488 bytes
SHA-256: 6487bd672940f330a3eec7b311e5f1ba1c291ecfa2fa5291bf8dc69229afb8bb
font_01_sfnt_off00010f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 18888 bytes
SHA-256: 95c4f87fce6412d339c480b603edb3dce724626cbc415b7e6502c9bc7cf4dd9e
font_02_sfnt_off00013f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1