Malicious PDF — malware analysis report

Static analysis result for SHA-256 35cbf2d4dab432a3…

MALICIOUS

PDF

87.3 KB Created: 2021-07-01 23:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d52051b583251d778b9fb2c7ed449f27 SHA-1: e234564d622aad9c7acd9c4161ea1d5e96aa4c1d SHA-256: 35cbf2d4dab432a32aaf82e3632cd6bf28fb392a2ed9dc44bf5e16327d5d709c
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the primary attack pattern involves leveraging external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=aretha+franklin+this+is+my+life
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/cd203de05d0b9723746a42fc3034aedf/siboxob.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/a91d026f2be090c66593827caba84b89/6239642020.pdf
    • https://apskarota.org/userfiles/file/77938546022.pdf
    • http://keralabiblesociety.com/fck_uploads/file/fidogezi.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/ff22928856626767a6772ac4b6925b11/9996304846.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e66b6d92c4---43493328808.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b08ee34ac---rumipax.pdf
    • https://sklep-pinokio.pl/web/uploads/files/69751386232.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/3c405429fefd426eedd0cf1a2c88d8fd/4422886836.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608253a55fbb4---jivedaribepad.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ol1ptlm4is7hkdkaharm7tftv9/23453850385.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b10565203fb---51640969502.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e37d134bf---texowisewira.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ea4df1a1a68b37bf3b30867bf1da0773/71158079803.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16094730e3c496---folokisinovubuteramajero.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ae9f5c9ec---tafiz.pdf
    • http://colorfulmedia.de/fotki/fotki/file/92810992310.pdf
    • https://monamifrance.com/FileData/ckfinder/files/20210625_4797901A12D40671.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb0a542ec---xovujovexizeboregokuberiv.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/jjeovu0cpct0kgjbhn6tivpsms/bixavapuxepemojuvonimuz.pdf
    • http://murasakijr.com/uploads/files/kudumakikajalorutirix.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8408929575---91878673243.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076bd9e9cc44---71333448824.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c636d62d2f---88785899655.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f219.bin
0d3c5909b65fb086efd1010e550faea93afedc9ff3e586b28568fa59749d5118		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 17552 bytes
font_01_sfnt_off00011f92.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F92 16792 bytes
font_02_sfnt_off000137a9.bin
9e0e47efbbf89012936056e866fd12e9d7df39345f2bf6996b80ed5b5df66ca0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137A9 10548 bytes

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