Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eaa5172a7c8a62d…

MALICIOUS

PDF

82.6 KB Created: 2021-06-26 02:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 360314afebdf9afc9fa9a140a13f03f4 SHA-1: 9fc137987ba6657723d8f99d7bbb88cef48faa23 SHA-256: 4eaa5172a7c8a62dbec94f05600690dc61297855f03258b2cb17ce70af653c62
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. The file's structure and link farm nature are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf061cd4f---30368093249.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3ed87d583---labopunuvezominabetise.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/d8a1e04341df7f937ff73a9d201f2249/fanuxalenof.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f696b36f3f---vevoloda.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/3cfcccb0b32cfa57be1fc3c82058ac18/70036426895.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/41n4m551r5qgplcq3n454dcg1h/12597792504.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086efafbf725---pirupufevoz.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/svrh90t3vduot0n2sk2kl475c3/7927061938.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e41935765c---62176911514.pdf
    • https://andrejc.si/files/file/46529489516.pdf
    • https://acgroupenterprise.com/userfiles/file/7527463130.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/26588499831.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/77d63cc87a6d9e032138d0e2ca203e5e/jilenit.pdf
    • http://rcot.by/pics/files/tagibonufiwifemuripuj.pdf
    • https://seerupit.dk/assens/file/wolikoxaginuj.pdf
    • http://buddhavehicle.com/userfiles/file/69566448610.pdf
    • https://momsgardenfoods.com/ckfinder/userfiles/files/11568895901.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/l1rmflrt0he43aeic1759qv1vp/47558350931.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c5db7aa0072c870f6caefb11c44594e9/51591830908.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e860fbed5f---79995660053.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+much+is+3+teaspoons+in+ml
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/15a60aff27b17e1b92bd722732f51fb3/gopafudabikemajajonor.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_off0000e08d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE08D 16792 bytes
font_01_sfnt_off0000f89f.bin
67fe7e851902b9a874b4e2358f7638aa36b05f6b04f78902912248c170ae73f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF89F 16748 bytes
font_02_sfnt_off00012435.bin
6a34a3ffbc1d149fb249b1a44e8256f958a5812155ab4cb0cacc27ea0d0118ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x12435 10888 bytes