Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed2aea90a53745c0…

MALICIOUS

PDF

86.2 KB Created: 2021-08-11 07:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7868490f71d63e7a742d93ccd406ecc4 SHA-1: 736f00545a7c448481260470068a713b07cf0d8f SHA-256: ed2aea90a53745c01105d239441a005ef1df2d27ab89e3bb558066346f7de026
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to trick users into downloading further malicious files, likely PDFs, from these compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://mixmarketing.vn/upload/fck/file/67053269507.pdf In PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/babufodedatitokafedu.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/53257843737.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/fepazalabapawikedekox.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/39261803724.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/92339948636.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ed3fcd2550---doporewatogelegenefu.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/kozatilugagarijuxajer.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f914516e6a---vipitejuxadokilariweta.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0dec218b3---46492973695.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/36277463773.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/2519726922.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/rizewapizarapu.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a18c040e845a16f18bee9e067890f911/madiwarijaterulib.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/83821873551.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609860944c730---rarosubu.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/7c3bafbc9fad39bf53a464c8a4990bef/95801026353.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e552578f3b---45864128724.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/luponalobukajusadiput.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/9i8b02ovcv94k9km36gok9tu5a/nuwokefodiluzeka.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbda2c58931---10103838374.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/1535622923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=journal+ledger+trial+balance+and+final+accounts+problems+with+solutionsPDF 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_off0000eb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 17060 bytes
SHA-256: d32944ee562fd5b3535c86590478f6603d19c77a6c0d9ee0b7ef9c799bc18068
font_01_sfnt_off0001180d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180D 11384 bytes
SHA-256: d0686e6b34b2a503879025fabe93c62bbd6d4767e13de0579596a7fc19d18e4f
font_02_sfnt_off00013251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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