Malicious PDF — malware analysis report

Static analysis result for SHA-256 7577f9de5d03f228…

MALICIOUS

PDF

117.4 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: 34e68f327b5af87aeb488b9a9b696115 SHA-1: 4e198bb0a568ecb115a2c091982e9d703849a1d1 SHA-256: 7577f9de5d03f228017b0099b0752420df5281479cc4593d786b1eaf442f73a0
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. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://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 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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