Malicious PDF — malware analysis report

Static analysis result for SHA-256 3144d5a38be10eae…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 14:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40d3a81509ded2075f235cae5a45c3a8 SHA-1: 73d00deb0437ddff3c16a685c37d14579cd316ac SHA-256: 3144d5a38be10eae00d59fb32918eafe97e1fe8b3e49abc212a8aaf71ab43eaa
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of a 'lure' heuristic further supports that the document is designed to trick the user into interacting with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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 https://wastran.ru/uplcv?utm_term=healing+with+hyperbarics
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9f5c56fdf---zabimikaxa.pdf
    • https://menuiserie-sainte-anne.fr/userfiles/file/buximusapusuw.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e980ae7c2ab---zabadibunasuxawugotiv.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16073b5ef726e6---tunezoluzefo.pdf
    • https://aarushimukhwas.idealviews.com/userfiles/files/53296896424.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/441b8571978a6ee74fe31d7a854bc338/tikigedinil.pdf
    • https://castilloexterior.org/ckfinder/userfiles/files/25045312541.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9ca89dc34a9c57c333d8ee498e1b7517/buwurumajisa.pdf
    • http://architettoangeli.it/userfiles/files/46151080761.pdf
    • https://capecoralliving.com/media/file/90438621195.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/tv256mic5geqjsme5hp2sk32h5/17517269682.pdf
    • https://limpiezasinasel.com/userfiles/files/fugujoxivi.pdf
    • https://marbeyoyun.com/calisma2/files/uploads/kemefafopejejiwotit.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/qj93tnch09ddoftu0uog0dkodc/95865325762.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102780370a45---99305937540.pdf
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/96713215481.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42fe75904e---79152941852.pdf
    • http://ducthoaudio.com/upload/files/votaju.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fda556cb1---mafitosodem.pdf
    • http://enewind.com/pliki/file/6431994993.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/q7l1htbhgp1dfv06bn653sts8k/vifamunatagar.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e734.bin
40f4673f69441a445aeba439b84a2d778cbaa11d08b31f91940828a533ee1c5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE734 17716 bytes
font_01_sfnt_off00011553.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11553 16792 bytes
font_02_sfnt_off00012d6a.bin
456ee822447fe981b4a526c9eddf75ab5ac783db7488864137039fa06a3458ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6A 10864 bytes