Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aeaf66b8f335a85…

MALICIOUS

PDF

75.1 KB Created: 2021-09-04 16:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 564a350789437e56d0721c66ba58e817 SHA-1: e4c88a54846e1f9166aea80e98077482e0e03de2 SHA-256: 0aeaf66b8f335a855def2e296130d900c47705b7ba2684cc173df631ae5cb5a0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains flagged as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The file's structure and URL distribution suggest it's designed to lead users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://micronforgacsolo.hu/UserFiles/file/genupexozexababijibuwipos.pdf In PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/jedidox.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf30da4845---pepubisodonoxi.pdfIn PDF document text
    • http://unsersohn.com/images/file/vimitizunivubawiwip.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/vudur.pdfIn PDF document text
    • http://www.bash.cl/media/file/wonataxuwilamutoguzexu.pdfIn PDF document text
    • http://getem.pl/files/file/2099261073.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/62190447399.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4372b198c---sinutud.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/pegifoxizixejutegagetu.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/8954171cbaab2d589a386a7aad6fc65d/jofidumubatazubewuru.pdfIn PDF document text
    • http://ausafe.net/images/art/files/renon.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/lubexafubukuriwixuxakobi.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609818c6cc30c---zipekesove.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160da8fd76d4d0---xirelomawapodenobudorovik.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160856ac120483---98000636484.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/vgio3ot34skptu709d7emvouo2/kunijikibabidugeraf.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/f3f4088a2fdd62ad5ee32d6a1e02b0cc/96028045443.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ac944d50---33459952146.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/aa9f5b3e5294eb5237e031443be4d9db/19244544181.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/83884185647.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/59001828920.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/97744649682.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/e46cp3k5jn14fetc3lag00fo50/84263849692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=volume+of+cones+practice+worksheetPDF 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_off0000c201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA18 10992 bytes
SHA-256: 1385b491758e6e0977db62c46b6eb4cebd44cd5df8814bd95b7106982dd3c239
font_02_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 16552 bytes
SHA-256: e0acfd29eb428ceaa054a444771623129acf5faeb18a2020960289a7ec58c2bd