Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb69100fe64ee4d…

MALICIOUS

PDF

72.6 KB Created: 2021-09-18 08:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2cda4e6980d9aabf10c4278653b397d SHA-1: 7ccb4ac6b261694b711d0c67170bd4c22dc54a62 SHA-256: 7bb69100fe64ee4d5b81842af52befb259d888eb8a375450b3c91fdb1edbe0f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farms indicates a likely intent to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://garglob.ru/uplcv?utm_term=dragon+quest+1+apk+download
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140eecce25db---47568097161.pdf
    • https://esprimagroup.com/userfiles/file/filejon.pdf
    • https://egyseg.eu/ckfinder/userfiles/files/xofilefoforatawepimite.pdf
    • https://betenenergy.com/sites/default/files/file/37187565575.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161417153bb77d---jusesusibovobanilu.pdf
    • https://didacostruzioni.it/userfiles/file/74244996588.pdf
    • https://www.jdconstinc.com/ckfinder/userfiles/files/totezijuzokivi.pdf
    • https://mavachhaiphong.com/upload/files/45622641231.pdf
    • http://satisfytech.com/ck/upload/files/51744019683.pdf
    • http://nage-z.com/ckfinder/userfiles/files/semuketumijuxa.pdf
    • https://mraos.com/web/userfiles/file/fifuxafikumepimuvufiv.pdf
    • https://penzionradvanice.cz/res/file/xosemupunos.pdf
    • https://evergreencans.com/userfiles/file/zulapenawitekufiworebu.pdf
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/58626325413.pdf
    • http://dochoiotovn.com/uploads/userfiles/file/47899555867.pdf
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631033774.pdf
    • http://lachina.cn/upload/file/fanususitizufanisuvugu.pdf
    • https://muacash.com/webroot/img/files/vaguxefuboboxawabonomo.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3abef6c8---18806508298.pdf
    • http://afro-safari.com/upload/files/25884028890.pdf
    • http://camel-republic.com/media/userfiles/files/20495837007.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614168dd0e363---nidarowupugakovil.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_off0000b31b.bin
d655e394d50f2f94f4ab72ee43e7ade83ba7337f67fb863f81e27b4af95acd1c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB31B 18960 bytes
font_01_sfnt_off0000e3c8.bin
0906ee739c50111160bd47b7da3db800683001e023524e72c3107a2b5808e91a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C8 10952 bytes
font_02_sfnt_off0000fced.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCED 16792 bytes