Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b666ea54497e41…

MALICIOUS

PDF

85.8 KB Created: 2021-08-16 16:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f769b6d76fc8217be1846264be1b640d SHA-1: 9c99eb493a41fa0e070411ed965178c5240a5577 SHA-256: 62b666ea54497e41a02873614eb56e8d7a164f89a8d69173a631ac12c6618c86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations. These links likely serve as a distribution mechanism for further malicious payloads, characteristic of phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://skisun.it/userfiles/files/kumikumufidorixemedimope.pdf In PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e0c2e341d---70312305287.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/62778668529.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093fb3405438---45593200225.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/2h0s512s5fd49ntelvbtq21cr0/powalorewunerimoj.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/masiwig.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/30760076818.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b121b223acf---bakubabigotuxap.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/02ca707b8ba32c509b41585ccce067ce/jimir.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/c5ddd1c9a916d2c47fb779859a16f143/rewofewarezojejamex.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdc3b7a95b---13693318315.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/d611064940c840ca1cbaacd2d18cd984/24602927844.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6c8eb9d2d---nagenokuxanebajukafatew.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/gokuwodabis.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/a2d43606539726d3494e691b1563585f/rajivirifates.pdfIn PDF document text
    • http://guowangcable.com/d/files/87460701444.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/59041294828.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607593813027a---39353345963.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160901ba763a9d---dadotuvor.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021080314492873499.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608674cae6773---72608557162.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f6ab7063e5c---dovabisebedizegejujixeliw.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2363003205.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd83b4c45---rodokirire.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/35914828792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=which+myers+briggs+type+is+the+rarestPDF 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_off0000eb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 16848 bytes
SHA-256: 0bf919f83756b2214310cfc7d0285090eac83642751f008f57c648a8db09ffda
font_01_sfnt_off00011750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11750 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F67 10800 bytes
SHA-256: 593c3588927e3f8425f9507621927054550d3381f09b8f0d93c135bb41790a92