Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1562052f53cb70…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 14:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ddfae68008a120b17b39877c4c97a9f8 SHA-1: b01052bff85824e8c8eae36e999817fc070d4552 SHA-256: 8e1562052f53cb707e78df6af23ec16cec9d5b2925da55af33c5dd88f0cb279f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites and potentially malicious URLs, such as 'https://krisoc.ru/uplcv?utm_term=vaillant+ecotec+plus+430+flue+installation+manual'. The presence of numerous external URIs and link farm heuristics suggests the primary goal is to redirect users to attacker-controlled infrastructure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://krisoc.ru/uplcv?utm_term=vaillant+ecotec+plus+430+flue+installation+manual PDF link annotation
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/1kkmc43c0gp51f3gl707ppv4n7/livuxuliwisivojexi.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851fe70ee11---dafudizefaxomifigefilixi.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/14320165973.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/nirofufitagoxoviwolumid.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/tapigugusax.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161040c710f28a---nirebuguwoxuwerozoxu.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075e801aac58---ludosuxikam.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c943c3e460b---namix.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/nrkuq8qn4rp15esm5keql54u85/zopegogotigajujirudika.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/14e32dd2acdf5f8dba4508400e20a77f/vuxono.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/16617915722.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/kagusufagowixid.pdfIn PDF document text
    • http://sddshchb.com/userfiles/file/Fl202108261055197011.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/36898141685.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/kefoxuza.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a145f6f23e788c98d1e6731ba62d5c2/23383703500.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612730c688f8a---97573446183.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/51064691644.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/360b8e440abcb0979e821b54ef451566/61324543249.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccdcd96e2e---76691091409.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b89ff70aed3---11815419428.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_off0000d9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 19856 bytes
SHA-256: 1e53221e87513b79652badfaf6ce09d33bef6838384e5f97e72905225b03c730
font_02_sfnt_off0001240d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240D 10980 bytes
SHA-256: 1f2aa74e615c8f994c6b58cc1280c8d9fd05be698d5ae2e947b497a62dfcf8de

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