Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7f652a897a01d2…

MALICIOUS

PDF

77.3 KB Created: 2021-09-10 17:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 861516efdb37b6237836542fa6b67f22 SHA-1: 48b5b8e1b56d83e362285399183676be442fe806 SHA-256: fa7f652a897a01d213a9791cafaac737f133ff097bb838b51cd7f57b294afa05
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, directing users to various websites, some of which are hosted on compromised CMS upload storage. The presence of a 'download button' lure suggests an attempt to trick users into clicking these links. The file's structure and the nature of the embedded links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://almudenafernandez.co/ckfinder/userfiles/Files/99209214122.pdf In PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4575e2c16---35263643192.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/rilimiwexagibik.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/35684568919.pdfIn PDF document text
    • http://veitali.com/upload/files/78743717566.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/63085070824.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/pefixirevofuj.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/85473051682.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72518447109.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613997f71a33e---2118568141.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/kebafitojigaw.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/73vrvhu9fmo5jp6br617584fdj/movufudijetijoruledo.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/fa962b93ae359523c6cdcd7bdbaa865d/vokufeji.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/tekixowosakivefuguzebiw.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/62444582285.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cd44ade84---81873752254.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/60595699631.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/xebafidezamugurowaxiv.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/22718492127.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/36941330668.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361ddc50138---vesuzun.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/14932933512.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/gefid.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/f55636d320b5bb2465844929a8d95479/ravagomadolobedaza.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8659ddae35d1cc7379d6e97615824ab7/famavipetivatufozakamiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=kis+kisko+pyaar+karoon+full+movie+download+hd+1080p+free+downloadPDF 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_off0000c44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44B 11496 bytes
SHA-256: b04398b4035e20d154d15764f88a4fa037a070526b3cefb50b94c40597a95397
font_01_sfnt_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 18492 bytes
SHA-256: bacd29910003ae3ecf29e91c46f072cd4a44310742d24d402f108599f83fa7ca

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