Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1b0f751ff735b4…

MALICIOUS

PDF

108.2 KB Created: 2021-07-13 19:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9a39a2534f03ef18204699f1e4a11dd8 SHA-1: cc8c6d467976fca0ba74db28c1c9c5be1dbe9454 SHA-256: 2b1b0f751ff735b4dea48790122e37a31e6a0c044cd66dd2633f1dee28624377
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba90fc17dfe---66268310023.pdf In PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/d13rln0snqno0090bk3bccoas0/93468132857.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/41105830198.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/42465199361.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/89547745494.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/dasep.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6121edeeb---vitojokazod.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16085485089c72---94896782758.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3228bad0a6ae9fd8bae1c00a05d76757/bomoturemuv.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d02fbed617d---86822867399.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/feruronunobapa.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/65e255cf549899c07451c74bcd19a893/gopiwenekukufe.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/ed33b162a3781bc9e48e4ad6047cf89a/33960981864.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/41745550293.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c349101b533---danozixivij.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/sojasemakuzimovezozixufik.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f67b719000---62438785165.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607175cfa39e7---54930514416.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/07dc40b7d8722c699b1e9d49a5bc7b57/ditij.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074961d73a7a---xanomesuviwekiru.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a7f87907---57636327802.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/dusuledekoserefulab.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d2430674a---81726699737.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dc16ed477---gajanogu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607080e7873ce---48497495002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=jacob%27s+ladder+with+string+instructionsPDF 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_off00012a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A64 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_01_sfnt_off0001406f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15881 18184 bytes
SHA-256: 986a942fc0b393c7b974d5b67e45378923710836e9882bfd336106ee7bcb1533
font_03_sfnt_off0001878e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1878E 11000 bytes
SHA-256: 2025a61f742c20282b53b42f0859fe0fc8193692a15eb714043ef332a6439538