Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b473d49b82043d…

MALICIOUS

PDF

72.3 KB Created: 2021-09-12 11:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b851f6f4edecf10f2e740c82dfa795d8 SHA-1: 282b8c4b1e2b8f887dd11dc8d37c796d2cc6069e SHA-256: a3b473d49b82043d5dabacf14d33d24fbb865afe2f4887d90823258c6ec9db47
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm for SEO manipulation or to distribute malicious content. Embedded JavaScript was also detected, which could be used to further obfuscate the malicious intent or redirect the user. ClamAV detection and ML classification strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=chal+mera+putt+full+punjabi+movie PDF link annotation
    • http://farmaciafasolis.eu/userfiles/files/fumuf.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/21624135688.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/40441708804.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eefd5cfb5a---ruwowuviropanigubixu.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/16307808051.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/rukepapuvitifiguzen.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/levik.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/luwusivegi.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/49943307533.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bb02171f---domuse.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/63274236165.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210909035008.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/jodivubusotixovot.pdfIn PDF document text
    • https://kaparatt.com/images/File/98189271185.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ziropuzomomo.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/47428371850.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe2247bebd---vulunasu.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109091054027536.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/meduravudikuwokus.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/sowexiwesiratelajatu.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/48963307641.pdfIn PDF document text
    • http://prosquash.by/data/84569990832.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8b6085089---rekejewobula.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/95664525315.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/64264316086.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613083f64d2ed---duxigugefafedujonon.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_off0000ba2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2F 15892 bytes
SHA-256: 04630a21c3b70ce0def73c5ab8ba523cd33661b1e8fa63eebd745110d9d9d3e4
font_01_sfnt_off0000e2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF3 10920 bytes
SHA-256: 58656982417060c95cbc8e278ada54cb6f66ba33eb8bef93a1d21d993c09389c

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