Malicious PDF — malware analysis report

Static analysis result for SHA-256 f019ed41d4a61ff1…

MALICIOUS

PDF

117.6 KB Created: 2021-07-21 14:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bb4670820991b57a8e7218963e5784d8 SHA-1: 4f3e60e06dab1e32537cf42f37ab6b456b353225 SHA-256: f019ed41d4a61ff1d434a1ec7149ab92502407fd9c9f7f45afd9f11ee1ad0512
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting domains. These links are likely intended to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://npi-management.org/ressource/site-image/files/xakurizor.pdf In PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc53e86aa9---31543380519.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/jifabi.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/wurexowelegog.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c39b2d8e087---21666990881.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/3764c074471cddefef3d1f1190b36ab9/mosumenedafubogagizoji.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/60385954653.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/53826079011.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ab044439c---5166993409.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e635f6ff5a---40246485685.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c476dbcbb40---duwirisuvubitowokakupob.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/74929521031.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/10af5fbba1ac52879721e3eb635dfef7/nogeriwi.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/85c04ba7256ea39d934b1870f59c0f14/73573493386.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/dikumularuze.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160c943dd7eef8---gekojadevimugu.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/0544dc5d12ea9fb0a849ae6f02eb201e/xifok.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8024ca9dc6---27197242630.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/71c4a232d55387f4f04552cd6480359d/xebewutoji.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/705767dbc7a6129372d5b090a1f67b3c/22342827212.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a463295164f---58883168485.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/4618743718.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/4791071470.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/1uhrqcc40n1r75iqh30u1jvfk3/ferutem.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608464b9c2752---voromedumezusipedulik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=medication+for+dystonic+reactionPDF 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_off00016a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A1C 17280 bytes
SHA-256: eb4297c27955ac922387418af5986657f57f599261dd51394397a968f72203d3
font_01_sfnt_off00019790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19790 10528 bytes
SHA-256: 0568ffe2f59d89d93c9c1ee771b4ab6f6165e74e39b7a9b582bb1099763dcd99
font_02_sfnt_off0001afb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1