Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca4b2c88134b798…

MALICIOUS

PDF

70.9 KB Created: 2021-10-04 10:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 78ac50c776f9cdef67e3e4962fe2a768 SHA-1: d6e9a1f41769994985f5db4293bc56afcc4be1f2 SHA-256: 0ca4b2c88134b798274000315be031426f0ab53c820b8562594ad115eef27557
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains associated with link farms and compromised CMS uploads, indicating a phishing or malware distribution lure. ClamAV and ML classifiers strongly indicate maliciousness. The presence of multiple external URIs and link farms suggests an attempt to redirect the user to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nissanotogovap.net/uploads/images/files/97345919795.pdf In PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/25108676744.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6d6723214---23726868135.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/33944363882.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210906_030016_2153.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/95902313451.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/rixovosuvupitamub.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/59774231324.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b41634be6---68240276427.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/2896176772.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/xuwusumamixexevitifoziro.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/20489769756.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/vufigurozorolegojipa.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315e18bf90d---vepigujesoni.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20211041053487242.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_18_13_04_07_8519.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/lukedufezopig.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/kutetataxeno.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/80586020270.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/87323d4b3a0f1e4363e5d354e4622348/43630986967.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/bb051f0f1606af521dc21cf105035dfa/jabebaxa.pdfIn PDF document text
    • https://tepihtrava.rs/files/95354673178.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/69932745509.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/gipotufulosemefenoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=south+african+music+law+contracts+and+business+pdfPDF 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_off0000b402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB402 15352 bytes
SHA-256: 165f44ce3deade8dc99ba43813c44c5a4b7f76557b856ab99f1aadccda008c7d
font_01_sfnt_off0000db70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF387 11284 bytes
SHA-256: 0465cd019badaa86e279ce7ffc72b5c240f88de3d0ff2ae29528fffd077ed2f0

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