Malicious PDF — malware analysis report

Static analysis result for SHA-256 9030b64a010cdd48…

MALICIOUS

PDF

92.7 KB Created: 2021-08-11 11:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c89e839d17a9ac1c82fdfbe55a5332bb SHA-1: 307ec5681981d7cf300a06d8e4b95c579d104d42 SHA-256: 9030b64a010cdd487b3b43d0799390267d767e632ab8afc0d9846dfe88478730
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by a ClamAV signature and an ML classifier, 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 hosted on disposable infrastructure, suggesting a phishing or malware distribution scheme. The presence of a 'download' button lure further supports this. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://www.andreivieru.com/ckfinder/userfiles/files/9255403867.pdf In PDF document text
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/jogidipubu.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/7108240448.pdfIn PDF document text
    • http://sowitech.vn/upload/files/20228123083.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/43614677506.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/kefazerogiwalevovinorit.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/madizomedilofunajuj.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087158d9228f---86378940204.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/wegutapovutulube.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/xutatoravuvajezekane.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/sosik.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/7715ed3ac07a027a4e48482e1143abd9/53049928137.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/99240629815.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/zuwugulatatomobof.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085e4827986e---duwig.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c52d9b88b34---puxuzubumusapurado.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/41813369333.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/gapokalevizobuvavivi.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725e6ae8f52---sawezuzininivawi.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/7115520230.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///20484660712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+incredible+hulk+2+full+movie+in+tamil+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_off0001057c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057C 17200 bytes
SHA-256: 76884c98186a3605c527ced601a591de76bd3eae3c9a2aa34357153a4ec03980
font_01_sfnt_off00013236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4D 11140 bytes
SHA-256: 3bc7226dabfecfb94d7937c644042606408a897342c4a004e55e19324a66b61f

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