Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e9d777a700f1e68…

MALICIOUS

PDF

84.5 KB Created: 2021-07-25 20:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5a90631014bb85eaa44a593f8c6839af SHA-1: 8a39cf3601926d3ca85a84630c5f58de0b8fd1cd SHA-256: 7e9d777a700f1e684fdec37b4fd6fee1a97eebe87a8f0e7c9d784c4872f33386
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various domains, several of which are hosted on compromised WordPress upload directories. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://matthewsmillsreunion.com/clients/c/c7/c7863f7b93cb17915b2a89d887155530/File/79922905281.pdf In PDF document text
    • http://kasystemofkarate.com/clients/861259/File/xigiberirunuwegikak.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/ledobe.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa64c5dd5c5---pewiveweropumutoxiloj.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/fumovuniwur.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831a8121eec---dorofilafesedajuzalezi.pdfIn PDF document text
    • http://cuacongtrinh.vn/upload/files/gurixul.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/76193743192.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/terofefuzubutasidatekoxa.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079669271f24---62898911633.pdfIn PDF document text
    • http://nakatka.com/files/file/fikeni.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/cockmrft7i79pdngnuhagpjn32/ravakalawo.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/josuwexivizeraz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a56e24b79c---goxeziporunodifeb.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/9vv03719vdsnk44gshuafepamj/1113006495.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ogftdktam8thpb1lncdg2sucog/3985839531.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/87956863314.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c7c4f1f5d45aa6a4809c253a7f290b63/raxexojosagad.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/donewarowuzavowiwul.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/puwoxofurigibe.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/pibezikenodewuxunu.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/jakig.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16084c2c2f135b---xiremusoku.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/15e5d8021cd4db976fe62047e8520dbd/bunorigaguxeder.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=avatar+a+lenda+de+korra+4+temporada+dublado+download+utorrentPDF link annotation
    • 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_off0000e0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BE 19708 bytes
SHA-256: 76843963c793ecded26e105fde21b1a33558314e8a1537b111b03fa14faaedc5
font_01_sfnt_off0001113e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12955 10836 bytes
SHA-256: 954f697a9ceb6ee8502c211faf99c855f4655d64f8e2d000c77c5d653e8a6d29

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