Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fdd355e1114a1f9…

MALICIOUS

PDF

86.6 KB Created: 2021-09-07 00:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1eb3f97a729c6bd6cae41bb0f03e2608 SHA-1: 0133be90960b33691ed48569a618ac3fb25dc5bc SHA-256: 6fdd355e1114a1f9510e4f02f3424f670995242250bb199c6497408ce7baddcd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The file's structure and URL patterns are consistent with a malicious PDF used to lure victims to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://eaas-journal.org/survey/userfiles/files/nobilezobanufodumemek.pdf In PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/d3f8837ded5f81889b9fd93f2aa34b64/76508705671.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/13592322699.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/mawevonipaxeruvatikap.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c599213ea1---toxufemopi.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/tenezamigotodazamujoja.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608687ad024a9---55749716870.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b89363109---64001963370.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/xixetiw.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/60949516813.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ccab3a48f---46282660647.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/refezodiwitakemefuwaka.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/79580566922.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612dc833c62b3---loxidozipokive.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b19aed3d---64653564963.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4905da0cd5---wojele.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/43138727691.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/rojavotef.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acba5b58970---61837244500.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/k01jva2k4jvalpe0e1j6v54t88/77314975508.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/6225029668.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/3a237bfdd5849167c1bb56bb697815f7/59896589689.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/38208176289.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/7a9f719f1595b2a0d5e4dcff5d707805/zidoporuwigezidudaxisuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=advantages+and+disadvantages+of+drinking+water+pdfPDF 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_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 10852 bytes
SHA-256: 45ad3731c807366938ac47467ab5aaf114640fb4aac3aa2b8a460c6366b836fc
font_01_sfnt_off0001075c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075C 17536 bytes
SHA-256: 481d14642cec609389a4e00eaddf7db53e8e35633704b6ece58f7162ec1f9ba3
font_02_sfnt_off0001340e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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