Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d80b0466ddb13c6…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 18:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 89abce4696e3050562094c9adc3a6df0 SHA-1: a227c0d673a7efb3a520371992485c5e090a90a9 SHA-256: 7d80b0466ddb13c6760c1385af241df470fe00401dbe5cc038e2e18d2bc9aa32
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting domains. The document body is unreadable, but the presence of many links suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wct.goldcrownresort.com/magazine_files/files/ziriserurubepeso.pdf In PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160909346d6055---25379474559.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/84130841611.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/3919224761.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/qim0j1a1b782ui8nkbeq5o5014/31881148209.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/boguj.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210720_215358.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a68e8fcca---65080704470.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/28842b03606ed25d7462fb63deaffe68/wiratuxokotatuzoxisezar.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/7246965707.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202175127235809.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/31d4d0d8afdedb614aa1915296ccf350/zatajedorowikatabexefode.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/14633691061.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/pasedulelapisol.pdfIn PDF document text
    • http://skupka54.ru/upload/m/pejeko.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbdc913a46562f6998a1421cf103fd71/75967964969.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7b149b57e120489d0fa356b24cd9b870/89883442650.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608485ff0cd2a---12691714713.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/56961419945.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/55719684210.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608032fc3bc72---89737679224.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/wepukuboxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=effect+of+brexit+on+uk+economy+pdfPDF 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_off0000e1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CA 17816 bytes
SHA-256: a9a21ee6101bb195915c0b5cb9dd92751daa566fd0544f6ba62e46837ebfc765
font_01_sfnt_off0001106c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12883 10936 bytes
SHA-256: 12206e98edb0dd3bcf2861708c1e97a50e15e007012bfa36a829598faa7750fa

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