Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d612e0e85096e94…

MALICIOUS

PDF

78.7 KB Created: 2021-09-15 22:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e8a6b131f2db8e6195cc99455a90bb80 SHA-1: be2a04c2a6b176c8265cb2b07bf1bd7e405f58cd SHA-256: 1d612e0e85096e94aca028dd39b6d6c4ed1ee1a7c0b56ef19b6afb78d1741bd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories on various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is unreadable, but the heuristics and URL analysis confirm a link farm designed to lead users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613d338144d48---47662988107.pdf In PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/vapobawizidafafewuzefake.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/mepebagod.pdfIn PDF document text
    • http://espwireless.net/uploads/file/pubowiwibenadufenuten.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/wizisekibozezasatinal.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/kuwetoz.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/guzaviwulejipejojajomom.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/96089360699.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/79269383201.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613826d304408---xuzuvuxakazuvurezilip.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/34259723427.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/wuwosibatepotujenamolox.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4bf37305---94742031116.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fccd6d5011---guvadarunaruserafibekagip.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613802f9b52ab---28302371383.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/zosegojopadenovukovezewa.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/tabubejuxawipusapi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339a73723d0---vulujiluwubas.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/80205598346.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/21954468609.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/komevuxewarut.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141109707d9d---bofobuxemifegokod.pdfIn PDF document text
    • http://one9five.com/userfiles/files/2358497412.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/zaditusolubujuget.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=call+of+atlantis+full+apkPDF 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_off0000b962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD179 10344 bytes
SHA-256: 6b68a342c9b1286a755ead0636960121196b07e15872fb3f2538436846d208b9
font_02_sfnt_off0000e8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F7 18516 bytes
SHA-256: 5561d9c07ab2347df1da1a5554b4fef381e0d16f407ef81e43cd72227e30f955
font_03_sfnt_off00011716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11716 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1

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