Malicious PDF — malware analysis report

Static analysis result for SHA-256 db807ad253e6d270…

MALICIOUS

PDF

86.9 KB Created: 2021-07-08 00:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ff1e571d8bf3282c0fe06d380197e104 SHA-1: 63e482fd04c7c4884741362f0ecfa0d1373fe656 SHA-256: db807ad253e6d270e89c96034600014e4947854b92c2e636fde00968d96d36e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely intended to redirect users to malicious content or phishing pages. The presence of these links and the nature of the detection strongly suggest a phishing or malware distribution attempt.

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://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/hd1h7e89jdsdfbeh8jm9fl1657/79769878975.pdf In PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c146392ec---ditabekug.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081db10930fe---19639886968.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/j4d2l26bcjkfvrprq51i8v5r03/bilamabap.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/118d50fa9f54deeabdb7b19dad9c33f0/xoligel.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16205911413105.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8efd6cf32---toxozagidiberojumepafabop.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/tamulokemudetemanusagufu.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e70b56f840---96690959545.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/10c599f36e2886c0ecf191d713f42c47/60312298568.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/80529377834.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/e193ac71ea11581e2dc94f9d5b51474a/robexerikidepovijoru.pdfIn PDF document text
    • http://dienmattroigiasi.com/uploads/files/nupijulezub.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/tizinafetebop.pdfIn PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/mutawuxupuzovixi.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/89937000008.pdfIn PDF document text
    • https://campermagazine.tv/public/file/nipegadoganexafafegut.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/15015966688.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea31b406c4---purixodiruselit.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/76503844076.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8fc57c87d---setitefidavasolimof.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/41466856892.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/83985354077.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/bivatakamoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=living+life+on+life%27s+terms+meaningPDF 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_off0000ef52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 17240 bytes
SHA-256: debe02f35ac42114ce88cf29e221bd349b2aa6e1e9e7bfced5ba8d0ed7bf63a4
font_02_sfnt_off00013431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13431 10612 bytes
SHA-256: 4c87175337dad6139c221d659679aed07f496c9c88b4c3894a879b2a086d8193