Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c336c94537abf50…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 00:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9931f1fe9d4261bbad30343b9b0dce59 SHA-1: c9b925da118b635de4a644964c000f2eb1acbc2b SHA-256: 1c336c94537abf50ee72357c7aa6f0abe8f9dba8bc00f590344c8ab125a35116
204 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to compromised CMS uploads and a link farm on disposable hosting. The presence of a visual download button further supports a phishing or social engineering attack. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/14c714ba926967035604b1252718a01b/wewogijako.pdf In PDF document text
    • http://brandiassociati.it/userfiles/file/92039266415.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/0k7b9hiq9csnlvn7p0sbj1ale5/bezerupetexe.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/81899804226.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/gimetufiwijojotisuzu.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/13049207368.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/icie7km5an5kcm1cqgksvce4vp/51690622239.pdfIn PDF document text
    • http://dongphat.net/upload/files/50891723988.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/vawuper.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/79f634ef5d26753d10225b2122d8f296/lopejuto.pdfIn PDF document text
    • http://zuszdounky.cz/files/zemixaw.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e5902de7a---xakasazema.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/9861432541.pdfIn PDF document text
    • https://upaspor.com/resimler/files/jikibo.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/bpseknvs37ueo2ir7m2kepmrcj/vaxirud.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/romekapakozibegudisovesi.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/43q2c9l6sgpkctlmk34pcdp2ci/tusomu.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16078ec070f03f---90446205808.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/81475407228.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c21cda7956---84275510243.pdfIn PDF document text
    • https://ijpdua.com/contents//files/10164304824.pdfIn PDF document text
    • http://armanetti.com/images/61707690244.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/43144616238.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/vatimul.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609215994dcd8---zasevujav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=area+of+a+circle+with+diameter+of+16PDF 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_off0000d83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 10756 bytes
SHA-256: 29d48b543b208fc9fa99a66b896ab11dc4f3ed5af0377965cea3fd8831cc450e
font_02_sfnt_off0001092f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092F 17560 bytes
SHA-256: e3f16ab4e3a10cfa91493536883fb0c9f4c016c8e3d19e71ff689b0fec3d1c0a