Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eaefdc44132b470…

MALICIOUS

PDF

92.9 KB Created: 2021-07-06 22:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d1f9a17a73a49cc3b552db9ef8866599 SHA-1: 3af5ee01bc55f8b4c3fb8803e8464407a41368f2 SHA-256: 8eaefdc44132b47009fbbbc27768eece6ac7129e2d333711f1ad9c77cf3c5c81
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of PRC/3D content is also noted, which can sometimes be used to exploit PDF viewers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://inwebjor.ru/uplcv?utm_term=starbucks+policy+manual PDF link annotation
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e577c35cf---39351702694.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/82num5en6j2hfu1qv9jlubjnl0/52670124126.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc394460bd---kujevenozowavo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160969399c7fad---20280631709.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/vabexupujon.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608211b52b13e---bigosopo.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd127f99f84---3149774046.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/28491430728.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/zubowobotiweruni.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/ziwekunavopivimur.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/94187172740.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/f732abc441cef6ad4aab5fa2821c8a9b/xaxawebobinana.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210517015535.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210531072953_pzg9t4.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708f565ad35---75953806242.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/retegofigebopozinodofe.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160861ffa05292---linumatetewupejamaf.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/20571a048cf0a56469ba0fc92f9fd62d/budavidigazu.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/47504468557.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/e83a009ef8cecb7a0a98088466bffb86/pegotimerokapusibe.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/39836966118.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_off0000f09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09E 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_01_sfnt_off00010616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10616 17788 bytes
SHA-256: 22a010778f4b59cef81cfe1baff02b02764156252c6c7b3b1f3637092024efd7
font_02_sfnt_off000134c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C7 10924 bytes
SHA-256: 4e8e812c1965c591838ae7fd32cce6c843cb250d02086bfc6545b11c5b7bc9fe
font_03_sfnt_off00014ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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