Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e645dcb4456f6b…

MALICIOUS

PDF

75.0 KB Created: 2021-09-01 06:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bd416023bd14ac28b2fe685e77d9817c SHA-1: 79056c5834872a2696d5c4558ce0b00a5547bd96 SHA-256: 27e645dcb4456f6b2d52826346bc8a09022c052551d9abb07a726628e0289d31
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains malicious content or exploits. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to redirect users to malicious websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://sutinlawkrabi.com/ckfinder/userfiles/files/kudexuxoxoniwegudowi.pdf In PDF document text
    • http://cpk.by/ckfinder/userfiles/files/komodopibevonisotebut.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/55186655797.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/19085470989.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210606_095004.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f73f42653---molunifipo.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/jojexafotufelivosa.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/54224463259.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5758ea9fe---47075600221.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9e3e94fac90154a0bee9a783e7d2ac0d/43993172251.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5d22ba2742d9c04dde3d732bea8cc957/41637507116.pdfIn PDF document text
    • https://inncredel.com/uploads/31421992922.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a34a22cfed---suvafib.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/883e28a06ad57ce96ff9a318ebc77a05/47903286794.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/2845967244.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210703061810.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/mujusuwezugoligusefig.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092d7d24d379---lusisobagawefus.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609252bdde5df---muvixog.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b7c82ba41---saponopaniwoj.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/72859913867.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ceaf031227e41e5284445790a66e1c8b/vogutufemidugifenaxorum.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/99991631861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=neowise+comet+night+skyPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14D 10640 bytes
SHA-256: 3f1f036b23e52c28c45a819b9b665e0f4a9d4417ba63507c300198f3d4736276
font_01_sfnt_off0000d994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD994 17120 bytes
SHA-256: d7f13a85410a1493716630514e0cbdc77bca4fbf39a919583bf90801e330fb29
font_02_sfnt_off0001066b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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