Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe92dd3eb6266d5…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 12:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f121b547dacee1d08009f9c41fb98b32 SHA-1: aa2c822ba1873ee250fb841983f9e9b93109946d SHA-256: 5fe92dd3eb6266d542ac6ffc7963e358d2417551bd5e5d03ceb2e85ceb67e297
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple domains, some of which appear to be compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the document's purpose is to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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 http://salon-urody-bellis.pl/images/file/77066833145.pdf In PDF document text
    • http://shceping.com/upFile/photos/2021-8/file/texikojetubabevotaxax.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/62432282142.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/634feec6e6dda96bcdaf4375432553fd/nobofetimosimiw.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/88ce135bd26eacde30c27494d9e2d72b/xijovasu.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609846105197e---44746057280.pdfIn PDF document text
    • http://ramayafaith.net/clients/64268/File/61115412636.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/niloxena.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/megaraxulofip.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/to05fqudk99r6o6dvdftm72kfd/84991451956.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/855f9ce66ef10d86a57e5845e3b3b6a9/miretatumosozesorowena.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/nazisimakugedemala.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/gibodugoreku.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/48440810860.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/72435500972.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/12866cd49913c52c2aeca1917f43b2e0/18750947675.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a961f4b33c---23918494497.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/0388ec97fb68cb9a48e342b72965f503/dirixixopelotopisalax.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/gurifilebezerobo.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/noxunumiwinim.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/87118733822.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16129705c5ea83---kutovifekawosigut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=policy+and+procedure+manual+template+wordPDF 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_off0000da38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA38 10808 bytes
SHA-256: e90dc062de2fe3e280175ab7455ce225aeaba3f5b58acc6f217145d456b81f52
font_01_sfnt_off0000f32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32B 17072 bytes
SHA-256: 005ef89640121c0af985054563f391f92b556c71b6f200d388b1f35b339d8973
font_02_sfnt_off00011f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1