Malicious PDF — malware analysis report

Static analysis result for SHA-256 c606d8860905e7a0…

MALICIOUS

PDF

88.7 KB Created: 2021-08-17 14:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e732d59358aab9aec571e9b5c1fc7a0 SHA-1: a9a05f0e2d07e7aae6aa53c4d0640d727d1abd5b SHA-256: c606d8860905e7a0aa22ebc1c53447f46831b5317544d0f8595b006a70613b89
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The primary goal appears to be user redirection, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crewmak.ru/uplcv?utm_term=download+act+like+a+lady+think+like+a+man+app
    • http://ecovn.vn/uploads/news_file/varimegilatizazevegikixo.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/8004bbeab9645789ee9bdfb17131e959/wanadugevifivuzokadar.pdf
    • https://debcopharma.com/userfiles/file/lesevovaduraberote.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/e3qiovou4u7mi3elcgag5hsdj4/susetewadoletofo.pdf
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/58739388571.pdf
    • http://studioprogettoarchitettura.eu/userfiles/files/387986159.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/fc1mo55gcs6jli5b19v7b1j45f/23667043641.pdf
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/tesixolukemubavuwigul.pdf
    • https://limsurempat.com/contents//files/48403085455.pdf
    • http://bnblspecialities.com/userfiles/files/kasudam.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/169fd930797aa3f7d8965a2999af1c6d/xulesunifozixewujifo.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/bvvpugccebst8vrh7hnouii5j6/jusogakamodilagenedoz.pdf
    • http://tianfonmm.com/d/files/922764144.pdf
    • https://biomisszio.hu/tmp/depobopegorelekazotiluze.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c8792cec05d---tuvemakusitazesuj.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/9f856d19c09aa7d50081d797de444370/mubovokebu.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/caadeda2662d34f880a3ccdabb4779db/wizamitituwufemaweloguxim.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bcfe5c458d---vewoj.pdf
    • http://thamdinhgiadaiquang.com/img/files/wapiwipol.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/2097bb367cfe65233d9ff2fe2f92162b/94929354970.pdf
    • http://delshadian.com/public/userfiles/file/35361156382.pdf
    • http://tycoonmedical.com/userfiles/file/1996389488.pdf
    • http://csc0512.com/userfiles/file/20210802233551_grkvat.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/cc8e5acfdcf9dde7ffb21a5a3733c88d/poxenipokudalari.pdf
    • http://sooclose.eu/upload/File/50631733008.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f797.bin
32d8b3a56a03fc8391772260545056c93e7531611605b86e9b2a7dae69597985
pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 16964 bytes
font_01_sfnt_off0001237c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1237C 16792 bytes
font_02_sfnt_off00013b93.bin
2330a83dd9854ff3e7be6b49df56298a2e461e3bc8ff1e37e1bd5e8451134029
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B93 10804 bytes