Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3c2ac07ce431da…

MALICIOUS

PDF

99.7 KB Created: 2021-07-09 17:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7a6de4fd96e67980b9b083d02fde44ae SHA-1: 8b9cece068aee925284f0c5d9d04e46d600dec40 SHA-256: 4e3c2ac07ce431da5f9d6a890a4f8e7e2c2fe8f68b4e1c11d79b12b548ac865d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d153085b6a---levemikukaliv.pdf In PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adad0448ab1---74971001567.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210706185016.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609acbe59d2e0---genifiwabel.pdfIn PDF document text
    • http://fittbikese.hu/files/file/zijubategawewipowiwur.pdfIn PDF document text
    • http://riversreunion.org/clients/8699/File/tozitefevuregeguxi.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da33b3c1d7---nawewafejupinapatakite.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/c4f5af67ad9f0ed1881aae23a4d829a7/41144516164.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/molozuzanogejow.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082e80963621---37584274148.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/sijikavuwoxi.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1107d63877---vapasixizesurida.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xilipazibafugosanenot.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/42589595829.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/t41l5o064vmjn08o6dbqdorqei/wuzebojuwafevajimorusu.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/rigelebujalum.pdfIn PDF document text
    • http://wych123.com/upload/files/wijik.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021052003555273499.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/ladosemezano.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe97787913---57448804038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=is+the+property+brothers+fakePDF 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_off00010aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEF 10508 bytes
SHA-256: 2c55790fa07a7cea77a997536a2e117c59cb7babc8b25ea830ae1452dbb33ad8
font_01_sfnt_off000122d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D2 17876 bytes
SHA-256: 03b0143d13d60f36f762e20f96cc29a60ee97dab830c846e0aed287f9a659232
font_02_sfnt_off0001522f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1522F 16544 bytes
SHA-256: 66b7945b99a9c78025a9a0ace4161995b24b08b80ea391fd428eddc3553bac27
font_03_sfnt_off000168f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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