Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4123c0c7df3615…

MALICIOUS

PDF

73.2 KB Created: 2021-08-28 18:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 73cb5fd373e621c852800815c4e06583 SHA-1: 4def9ffbb91fd4bb63268c3b0f2c917c9feda830 SHA-256: 1c4123c0c7df3615f452cb2125d18498951bd1e6c2feccd9d2422af90bb6b1f8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d1b59fc3a---70242354343.pdf In PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093bbc1e2c8b---zuruzigemoti.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/makumurofopajikexutupus.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/57849847713.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091351eb5030---repuga.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/77187806056.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/jejad.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/75129871843.pdfIn PDF document text
    • https://aildf.in/userfiles/file/vuzufi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f5f2a973c64---23021000489.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210719093517_ftzv61.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/pijubagemanitajuxasega.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/88b4rcc0he1v9os93n4t7jv46d/xiseguro.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607405d7d45ae---58090339706.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/4b1jlu9c2afiuihh0t8khotgo4/44868559593.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b89ba44326f---didapadibobovatigoji.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895a5d83eab---zilojubit.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/fevololejan.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086aa80f05c5---ritexase.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/5433064555.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16093edf8af9f7---vamemomadujirenisafir.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/45454dd6eb883ce267bbfb355bb885b7/25603769396.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/rogadumirujujureba.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/pobewize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=platelets+automated+count+highPDF 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_off0000bdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB6 10816 bytes
SHA-256: afb8d605080d066e2891547921c970c90aaa5226de013ca2aeb9bd403998702a
font_01_sfnt_off0000d640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD640 15788 bytes
SHA-256: 5d218577c800f7d651f9a2a66efd66adc5da96da11e27eef9b4a95d66dee6abd
font_02_sfnt_off0000fe92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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