Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3775997a7d926b2…

MALICIOUS

PDF

69.8 KB Created: 2021-10-02 19:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 20b0d1e5c848525db4d15e09b3834174 SHA-1: 793f58fc65225c20d95a6320f91ff7488e4fc6b0 SHA-256: d3775997a7d926b2a69a6d50da129d891e87441defbd3223183e93811de7392c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://puzynowska-kancelaria.com/userfiles/file/200683984.pdf In PDF document text
    • https://cplastik.eu/data/cms/file/gelopusabixitigup.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/kokojunetamabedavuverir.pdfIn PDF document text
    • https://festacontinua.it/public/file/jamon.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161505eae4296d---lagotikolisevikal.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/99113241762.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/47200416218.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/51952287184.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/18499338183.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210925_DB1766881E2E74D6.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210906_A82FEEFEE2076EEE.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613170c898bf1---ziginatufupovikipi.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/maranegi.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/7933739262.pdfIn PDF document text
    • http://firegallery.ru/img/upload/jopiwojetojununapag.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/bokexenaniduvo.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2e94416c80495d5f0591dafb00838e9f/zefumopiri.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/lunes.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/9968938044.pdfIn PDF document text
    • http://accronline.com/userfiles/file/68826334973.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/kobidagupu.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/24129367580.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/15975629717.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/62962376954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+tame+a+wild+tongue+analysisPDF 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_off0000b0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DD 10780 bytes
SHA-256: 5736290283ec4301c74003a98e8512ad2774b785708cfdd0dfc32edf2088e0f6
font_01_sfnt_off0000c97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18D 16000 bytes
SHA-256: 10c103de2fe4b2deedcede1a899da4f650c59dd1d8f3de650a2103922c60eb4c