Malicious PDF — malware analysis report

Static analysis result for SHA-256 309814f38eaf0596…

MALICIOUS

PDF

116.1 KB Created: 2021-07-29 09:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dac03a22ae57d5a919580ca4b77f0037 SHA-1: a37fd2b0b184fd0772853138e11694e323ae4982 SHA-256: 309814f38eaf0596044cb952b546775b5c9e8373e5315a1eb6d1a4dc5f46ea8d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, many of which host further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to compromised CMS uploads suggests a tactic to leverage existing vulnerabilities for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16076fab894002---48352176529.pdf In PDF document text
    • http://yoron.net/up/files/94854569619.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/64932239395.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/76117453023.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16086ba81d536f---6173836476.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/nonuvuvozed.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/muzitonojedawulirew.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/966a0eceb149edbc9ed9b567bebbc8c9/68951024110.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/vekejegavukepegeridigoni.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/g4ruini1f95tfupuhv5jbmm9j4/fitopafejovuleno.pdfIn PDF document text
    • https://isosklo.cz./uploads/xexefitet.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608395290fe5e---10943041134.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/2ed1948a41fa0d0f758382630205a149/38163835636.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/945c989d924a9a1165999fa76fa958e2/zajowo.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/rasagitadowikovixidasot.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/jerixagajewovuzufigiwed.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c80656f2cb---futezedusuwadesifaj.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a121dd4ebbf---zupakavugiwujuninimekama.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/19839ca5bda0e28292e30699068e3dc6/lobikimikanadubakoj.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/21643362081.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2273bf8ad---88603874436.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/aed3a4dba90fd17628e853ceaca4f1fb/52893970363.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/35653278893.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1eb9dc113---40898416863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=single+phase+full+wave+rectifier+simulinkPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000147ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FCC 20092 bytes
SHA-256: bc73cf0e210b3a996b3f01dd93e0cd1ff11855ef0996cec1893efd124d91ee21
font_02_sfnt_off00019688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19688 11224 bytes
SHA-256: 33aa37f9f68b3d62195fba6cfde69a4e97a0a33c213036492daee6587597846a
font_03_sfnt_off0001b0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0AD 16376 bytes
SHA-256: 2ee1ec406d3a0c1c4c79810ec39be372ebfd8b185b22ba15bc5b266ca312287d

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