Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62c9edc7e9ff34d…

MALICIOUS

PDF

102.1 KB Created: 2021-08-14 15:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: cb2538192d35c1aeb2c60b3a21b24665 SHA-1: c7a73c5f6266204c9f0791bb18f7906bddf7a7eb SHA-256: a62c9edc7e9ff34d64cc5abbe3276f1f91a0370362ce7c820da8648f86231f45
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, identified by heuristics as a link farm on disposable hosting and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the structure and URL findings are sufficient to classify this as a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://isvpro.com/custom/files/26985878581.pdf In PDF document text
    • https://buddhaart.in/userfiles/file/36425530110.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/el1imju7cr5koqt9ndmkn6pg8p/varerorotujufaz.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/lg235ndsck1uma3av57a9kcvg7/24509926890.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/nukitefeninelokax.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4b8233c3a57a3f02e5555f9cc5ba9cb4/rumojutazizadavejewadovab.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ggmbfn3gamej27pbmdaobgihnd/jebutubefaravujipovuk.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/69647682903.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/gapiwoxatapeseripud.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/fenudoze.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/pibumakipe.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/xebaf.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/fopun.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/9f538b1361291bc22aec4f3c68d3188a/lapixisoxa.pdfIn PDF document text
    • https://maclashoes.it/file/4763208212.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/14632780440.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b8f351674---99073934444.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/96978278274.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/q2o03a3cml1u7andel9v46j2g1/kulurifexutosiv.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/24979826510.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/15742531842.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f7a558d73---93841758150.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/752d5a89518e8e9f0e322a2f591c6c17/39716519319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=atomus+tattoo+pen+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_off00011563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11563 10568 bytes
SHA-256: 069a35a91e5e9cbebe38e10eceaf08ff5487fb6739179064085ed495f29a2727
font_01_sfnt_off00012d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D88 17816 bytes
SHA-256: 08fca752c80c7bf525081ef83b288f1294f6dabf44112cd3ae82e3957ed79254
font_02_sfnt_off00015c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C69 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off000171ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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