Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a38d44878b4485…

MALICIOUS

PDF

92.5 KB Created: 2021-07-01 00:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2afab2ee691a4c82c70448bb4065a2b SHA-1: a081287e6442ffdbecd7ad64f8a2e41ec8626196 SHA-256: 34a38d44878b44859712f509016fe4b8f028a060e64d34c48d092a9bccfebded
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links pointing to compromised CMS upload storage and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/017f5e690041b7072ceda98e2e0873cd/53083187037.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/4e7k28p60o9vnctjnqp4cbma9j/telukod.pdf
    • https://angkoronetour.com/userfiles/file/rovibatamajovugofamul.pdf
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/90478344298.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160889cf32dc01---25417159912.pdf
    • http://rbtyutj01.com/userfiles/files/kovelubabidujuzafozive.pdf
    • https://oklogistic.lv/upload/file/womoxufu.pdf
    • http://flatadministration.com/uploades/fckeditorfile/20613737677.pdf
    • http://rgn2u.com/userfiles/files/zasorixariseseri.pdf
    • https://ideylia.fr/uploads/file/35914847981.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608add5d19c1e---xiwomiliwurodefipulegupo.pdf
    • http://congtyvima.com/images/Download/nebavapale.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609e59ea21b23---liduwodu.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/50a8cfd1cc43f1a57ef74bbcad372c66/ludatetiriragibodufof.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69eeb0961d---93115976056.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b58f07060---tuxukojogisezirodomej.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/0066f9ca37d03399ce48d36442aff59f/sutesexixujuza.pdf
    • http://guowangcable.com/d/files/digife.pdf
    • http://beachhigh65.com/clients/879402/File/luseko.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/jubajefan.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/btm7fcmlqjqrfc3q8j20ukqvnm/fojidisaxuxoxosa.pdf
    • http://globalquestconsulting.com/userfiles/files/lalebuxavijuwi.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/57763841646.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddb5b50713---32432186432.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073858dbbe67---49591457315.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/dpskjamjj51ond8tevt80poh0q/24194405134.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=knowing+that+god+is+in+control
    • 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_off000108da.bin
2703b9c269873d89fff4e28cdd0253c8f8e1cf5eeaace0612a2b974b164a9a12
pdf-font-stream PDF embedded font (sfnt) at offset 0x108DA 16896 bytes
font_01_sfnt_off000134b5.bin
ccc356d43399fa2249bc7277f9aa62fd6924a230a428d1e521c2403c491750bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x134B5 10596 bytes
font_02_sfnt_off00014cb6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB6 16792 bytes