Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aed45d6c8d56d6d…

MALICIOUS

PDF

124.1 KB Created: 2021-07-03 11:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d369510b2102f4f76b07d9fd3458ef3 SHA-1: 5fc21d24f5c2dc7f51e2f64cab5a6a1e846e9997 SHA-256: 3aed45d6c8d56d6d03d1c115734be90f22e86bd2dcc9d10f766e1838180f80bc
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links to compromised CMS upload storage, suggesting an attempt to redirect users to potentially harmful sites. The presence of these links and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/a5m85r020e3n02lsq9vku67eh2/558602595.pdf In PDF document text
    • http://sterenstein.ru/userfiles/file/mobogukogojel.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/ecabb871e61c19803f39e10531869dc1/vutezasemiramijozexazet.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c341bcf0fd---73056997637.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabd59c466---14481486788.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/wowamoxunuwanefam.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/0nnjoq5j07o2v2sek3kipqd8iq/gegebezome.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/90kmc6bjjoec03qpbhhomvltl1/fuzifegeloduvasugedud.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/trbia4jrda7fu8llm01vl21qp1/ximumasosejukomegijofadam.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7booaoc2hq7n8vehdnoochi3v6/65642352525.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/0835b2545c3f094614d27993b5bb6d53/jenilofuva.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/jedexifaj.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b45132575---xuxakewinedopedomu.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ef2551b31---wuloginawisuwasuri.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/40jdcpij78kltlgt1m6f90q0cu/93017801030.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/5efciqd1kq4tt8jlglj5cmjch6/83565181086.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/lc4m3akarc6n4p7c4l9jmlan58/76807251655.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/uhvv8rhpf6tptb0fiqjkkobba4/31353760268.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078deb7e34a4---lidelezategesajaxulaxu.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c17fd02e1e---jufozivulutaludebuwi.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608869db32eda---rudibenuriladawirub.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a41f38eeb21---sujaruxurewugo.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/ptthqbefglgdk1fu03svod662s/xudepuximoxod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=confluence+self+hostedPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c1c075e13e2770f117fc44ab8990fa7b/79304646840.pdfIn PDF document text
    • 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_off00016b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B08 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_01_sfnt_off00018085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18085 10352 bytes
SHA-256: c8e7c2d564922cb58947c72e3156dfd27a23709f905207b18242aa23e3193862
font_02_sfnt_off000197ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001afff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFFF 19160 bytes
SHA-256: fd7c88c11732bc660d8a5949edc3174aae7bbbd791172d8b0890261f5c4fad67

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