Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e0a9b335098aeb…

MALICIOUS

PDF

113.9 KB Created: 2021-06-30 13:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ee9c52c5b0f44a675895c62721c8faa SHA-1: b56e502aaefbe0da1553b15715fd1c905ee649ed SHA-256: 65e0a9b335098aeb0b3ebb4a9975a9f543fcd8f89214971483f056e2fae6faac
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a large number of links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the structure and URL analysis strongly indicate a phishing or SEO poisoning attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 http://ctkupavna.ru/upload/file/gigirusuwovemo.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a2a08333b---87972501163.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd140cff74---xolunumodonidewirupeji.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa42b70902---dijakadasefogiputonojo.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdcf5f6aa---vanufapezazemidoviniwe.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16075ddee77a41---baxup.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adea5fd9225---93853496505.pdf
    • http://asiadomainstore.com/userfiles/file/87470599941.pdf
    • https://alrukn.co/userfiles/files/bapajudejesunevaf.pdf
    • https://isosklo.cz/uploads/zejazuluvazutukenege.pdf
    • https://rubin2000-distribuitorshop.ro/userfiles/file/rigasavawifopuwukitoxomel.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/441f91a2bb4e2c74f7b9ca9a98c09530/bekitemufaku.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab76dd4372d---wegedalopo.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85ba0e668f---71288877236.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/631efc37edf525cce54dd95fc89b360d/jifewogerinafanufawivufog.pdf
    • http://www.lnk-creation.fr/upload/file/7405929345.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71f6d471c---gulupetugizasazatavosul.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/f44lv3rfsbql6ojb08bqlgsor0/56476793184.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/boxexugazozotosavofanivi.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b52e1fbedbb---49316384290.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbabab50bc---90688354943.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/72ff9ed704e6f7605540b302d8e31943/podalekogubenej.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/a52fe6ebdd81f41a27b5ddcac2e96300/juxegofulagifijivo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=enter+the+dragon+full+movie+tamil
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000142b1.bin
30241b8b769747c7b658e782f2b033f14f7b2e5d86aaa77a04439a925063e967		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142B1 10784 bytes
font_01_sfnt_off00015b19.bin
a9832702feb156a80dc7c94988bdfc34daacb758bad515fa811cb8828fc6b0c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B19 19032 bytes
font_02_sfnt_off00018cc1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18CC1 16792 bytes
font_03_sfnt_off0001a4ce.bin
dc0ef69044754b4dc3973b96e1486094374d3171b0352c537bb483a79da7869b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4CE 5284 bytes

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