Malicious PDF — malware analysis report

Static analysis result for SHA-256 34eb924c0ece4314…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 07:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4641cca2a4e7223c4dc08714286d9123 SHA-1: 88c78c6c6c3a5079ece6b4926b5c4ded3652cc02 SHA-256: 34eb924c0ece43148f3df72f05c0cf210f3e6197708a0f81ee6976311b2e871e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and link farms, suggesting an intent to redirect users to malicious content. The presence of external URI links and the compromised CMS upload link heuristic indicate a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://krisoc.ru/uplcv?utm_term=once+upon+a+dream+piano+sheet+pdf PDF link annotation
    • http://st-communications.com/ckfinder/userfiles/files/28158809166.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/jezamal.pdfIn PDF document text
    • http://citra.cl/userfiles/file/logorigaxeroke.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3da3e1f02a---16279674610.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/97792433321.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/f4d84fd7dc020857f1cb82b1af3f481b/futoguluxejagajexutusivu.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af1331c823---dujapebalijap.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/3874162900.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/p9s5gvsek3vsftt58ckgtlsgj5/22758424929.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9981dd667---39260181039.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/nanozufuwopasexipem.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/vepawifuxiwis.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f69b659df---18749880491.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/penojegov.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/97758989123.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/pulefavemulisebabexol.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c302737a756---zabovidogaw.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16077eccdaf3fe---15350829042.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/tubovu.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/93iti29q81291jaquaneig8117/93835492868.pdfIn PDF document text
    • http://bananamusic.tw/uploads//files/202108012246142770.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160908683133e7---jufufewotetewemanat.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb966c03905---mikejufo.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/98038211087.pdfIn PDF document text
    • 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_off0000d818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD818 10964 bytes
SHA-256: d3a3cf62bb96fe4ee4594ef893ce2d7b0256c0ed9911e7cfdccfd7d50727494e
font_01_sfnt_off0000f15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15E 17672 bytes
SHA-256: b3dbcd6032bd135bcfce895a356202e09845daad6d1ff78c64e6789f54e4f7c2
font_02_sfnt_off00011edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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