Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe37ed23ab1336a…

MALICIOUS

PDF

79.7 KB Created: 2021-09-09 14:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ae52bdf61f428e6817b018efb3134ee2 SHA-1: 935a83a64496e6e930bf5235e5ceff1d07fa0e01 SHA-256: afe37ed23ab1336ae4748c4c0931fdafa19179a13f714d04bfe6ad0c76c2c1db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, strongly suggests a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=android+boot+app PDF link annotation
    • http://shopphutungmayphat.com/upload/img/files/febaliwevenurafuvas.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/wimabijebexepew.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/22663585838.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/xusoripesubo.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/84489166603.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/t86650v8paib42796cle3taumu/61405641691.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/befolokepivasadodaxu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161395f46cf5e3---kumiro.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/danudajefuvozotad.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/jatudipadixudilotogasof.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/zemupemoboromuregil.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/wagokufaxujaruf.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/poguwavosususox.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/puzokukodoxat.pdfIn PDF document text
    • http://pasted-radio.de/web/files/97728993760.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/41303714357.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/zetowawuxubatexakikulanik.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/posinowomubete.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/5192013476.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/40220384080.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10801851792.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161382cf9eccdd---popizofakoninivaz.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133b60ca981a---juxizifarilinojip.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/demupado.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CE 17492 bytes
SHA-256: 324eb076a3daef81d0bf35b7a81e47c266decdf904849c6602256193e7a3a356
font_01_sfnt_off0001030b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030B 10160 bytes
SHA-256: 764e0495348445fc05245ca2ff99420103f0f33ee9a6db9ca7d5675a7c50ab6d
font_02_sfnt_off0001199f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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