Malicious PDF — malware analysis report

Static analysis result for SHA-256 4613849e051362ef…

MALICIOUS

PDF

74.6 KB Created: 2021-07-20 22:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93790aa3c84766130cd873732ab96488 SHA-1: 7099e4c357a0cf5ba6165c7329d556033cfa68b4 SHA-256: 4613849e051362ef24d059822abb813a3b59679efaaae1861567b54ac5df151d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS upload storage and disposable hosting. The document body was unreadable, but the presence of multiple external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8aff84a59---20868936734.pdf
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/zufenixebiwalamojepex.pdf
    • http://partnercable.hu/files/10179899932.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/8ad659c54ec251c302374d8122cc2a95/nimozezagekabakutifiw.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/01erhks3cgvpvl6n18ts6adr1j/sixivuwarepu.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/5b71e99552099f84b38a982f34a1ded4/83380062887.pdf
    • http://originalcheck.it/public/img_admin/file///rofezowobudidoguwutebif.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/298aa5510733d1f3542ecb40bc6b69f0/48281699420.pdf
    • http://jshtextile.com/UserFiles/file///64128946875.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/6jf3kkm3in17invfgfava044o7/xodugutosodu.pdf
    • http://www.europesolidaire.eu/userfiles/files/39103996926.pdf
    • http://sskj.pl/userfiles/file/ledosowuta.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7137171ea5---33673343699.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/i9i2pot1bv2dh37r5kk0v0vjk9/bidazofowe.pdf
    • https://cairparavel.ro/app/webroot/files/userfiles/files/kakowulomemixawezekoxevi.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb81d4943c---todumufeg.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/1d3ef8bd99cef583c920e90668d42854/48605318753.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c232740209---82485635248.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c7982b872b3---voxuwaviliweximodarar.pdf
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/resezifotikakinogug.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/8272084b8d732de31adae344bf9ae46e/rogibeminudasatazit.pdf
    • http://aircond.md/upload_fck/file/52100644089.pdf
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/99282035477.pdf
    • https://lifesmart.ro/ckfinder/userfiles/files/94734673310.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16097d87b4b9fb---jekexipivogomivedi.pdf
    • http://kap-group.com/ckfinder/userfiles/files/lanavafemowojeke.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=animal+farm+questions+and+answers+chapter+5
    • 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_off0000c3a7.bin
dfb230df843dea498527c79bd973d10adf8eddfa8dc1d900aaefa8b70b677bd0
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A7 15232 bytes
font_01_sfnt_off0000ea32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 16792 bytes
font_02_sfnt_off00010249.bin
8c36703857716b6217c3484d2c0b0cd4d7aed83aa620e1193407160004b4c9e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10249 11332 bytes