Malicious PDF — malware analysis report

Static analysis result for SHA-256 20dcaec7e2fdea86…

MALICIOUS

PDF

109.1 KB Created: 2021-06-30 09:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46b1f361b27bd4edfcaaff55f35d263a SHA-1: 44d53fc6829742b3de982e3516025caa8eff577b SHA-256: 20dcaec7e2fdea8688d54c93bef254e95ebf5ae666dd54ebaa44b558019e5a95
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it functions as a link farm to redirect users to potentially harmful content. The presence of external URIs and link farm heuristics points towards an attempt to exploit users through compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076aba984244---25113061926.pdf
    • http://aitrans.cn/UploadFile/file/F1202106060354217780.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/f6d26582fe4956a02c4e4d976965aa8a/80343397495.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/c98cfda02e70385459558172d63d2712/gipizun.pdf
    • https://royal-art.pl/uploads/userfiles/files/94581870415.pdf
    • http://www.urbanwaterways.info/files/91119013046.pdf
    • http://asckhn.com/acskhn/userfiles/file/pizepazomu.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c013456e317---kazoxozisatejenibe.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160819fff324f7---15664715831.pdf
    • https://csn-alliance.com/data/files/vixugelijakiti.pdf
    • http://weberstellen.ch/userfiles/file/40635795078.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/047d5341d9f0d2ec8ad9691b78fc36d0/momim.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160913aed26d51---zemekolavufulozufagonutag.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb594cfdc5---kopixunubulegaja.pdf
    • http://woorymart.com/userData/board/file/18518756668.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab391a8f435---sebebeduposedij.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/90563229807.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/5975852252f5a7dba2de958355aa6a3c/35823967682.pdf
    • http://vyveva.eu/UserFiles/File/fegudusexagedaxitokumirag.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/h9mrv0jmsnm2hr03p75j2l090a/26788523189.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=plane+parts+manufacturing+company
    • 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_off0001480d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1480D 16792 bytes
font_01_sfnt_off00016024.bin
dbce420dfc223d91086746fa9ae2dcec71d18b7fa02fc5646affa824536b7164
pdf-font-stream PDF embedded font (sfnt) at offset 0x16024 11036 bytes
font_02_sfnt_off000179e6.bin
debd2f5d7ef5f810311543f822ef366ec6448421623359526d486810956bbb59
pdf-font-stream PDF embedded font (sfnt) at offset 0x179E6 17644 bytes