Malicious PDF — malware analysis report

Static analysis result for SHA-256 56344bb5ef875e40…

MALICIOUS

PDF

89.6 KB Created: 2021-07-07 12:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3dd58d88e4d5f9bec906c46a30440c0 SHA-1: 9870d279ada550471c894f3024de2011b66119c1 SHA-256: 56344bb5ef875e404cc404b1926e7c74b0043ef842ef3102b610980657c7811c
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML_NYX_PDF_MALICIOUS heuristic indicates a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd39e6dd8fd---95765593274.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/49e0cfd86b122c54f06815eb9ced00a2/40836263023.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/a001a6ec89222d1968d860cce1c9b54e/ximufawezimup.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/ipt4a53dpvsrr2egvd3m396te5/21283824702.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160854e834143d---xujoxubifinizowerinewitu.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd62a2e1b---fumuxojazegubowuvuwagif.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077725622271---juras.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b050532531e---82842676508.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830c71114ee---10330583910.pdf
    • http://naturalmis.com/userfiles/file/vobafafazakilokigoledum.pdf
    • http://campingwithconvenience.com/files/files/10903363825.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d45e0491d---wowizezuvekajegumafo.pdf
    • http://chiengthai.com/file_media/file_image/file/xoxujexanegexomifawufop.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/4m730t51vrsa8a7sbcjdje80ku/vitotura.pdf
    • http://backkwang.com/userData/board/file/86239026701.pdf
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/94692969140.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1026b2137d72119c2571203ee454da14/62789469459.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/e9b8d0ef5eb094f5a9b1621ad4c2a535/naludagexomumigajoduk.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/70edc8ab7009be2a463f34199363eb6e/77596290465.pdf
    • http://ibtaker.ps/userfiles/file/nekijoke.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd26c67f7db---99321787728.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/8a48a6faa3a3485b0a0eaf5970d057f0/23197745328.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607715d39b793---97135611255.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/hjp81bbqcaamvboqo6htkoojj0/fivusikoboxubi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=we+go+0+to+100+real+quick
    • 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_off0000f72b.bin
085001332a40d2844e9e5bb2ab9b3f791985192673d540f63e2351d8d9db29ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 10636 bytes
font_01_sfnt_off00010f62.bin
2283dc1777d0620d84d9c0d32ff901c634de24232269e5e2af170f552e0acb9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F62 19160 bytes
font_02_sfnt_off000140fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x140FD 16792 bytes