Malicious PDF — malware analysis report

Static analysis result for SHA-256 19875cef76344f91…

MALICIOUS

PDF

84.4 KB Created: 2021-09-10 01:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 72ba46b6171818b05461176f55fa2287 SHA-1: 1f4d81c95e0919291416768794753998d3232f60 SHA-256: 19875cef76344f91eb7b96f173294c3b37ba47bc5ea9f97e3183dba0767b8043
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites and other disposable hosting. These links are likely used to distribute phishing content or further malware payloads.

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 https://philabc.ru/uplcv?utm_term=uc+browser+for+android+free+download+latest+version+apk PDF link annotation
    • https://fivetc.vn/uploads/files/24226868817.pdfIn PDF document text
    • http://glassick.com/userfiles/file/bisowizosimigudifemi.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137c8fcc9e7a---8937892824.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/56879114075.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371b535e8f0---50801738388.pdfIn PDF document text
    • http://nincity.de/inline/file/viduba.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/56764998498.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/52123824361.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/situgovemijutaxo.pdfIn PDF document text
    • https://curvy.tw/upload/files/zawonoxijefefuborulesoxux.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131146259d2e---luxirusufaxobetej.pdfIn PDF document text
    • https://keongracun.org/contents/files/35112758459.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/65229918558.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/6f8609b74799c966bbb6771a15025e2b/zezapufariwotoratowuwon.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f60b8f8a3---35283390347.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/mgg0le26sola77gs25anr6nuas/pugudujinoz.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/a05b46de9a4b51a3117adfdc34bd45b9/gojuwonawuzawu.pdfIn PDF document text
    • http://oris-am.com/editor_up/63530882495.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/zeguboz.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/7716891645.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/84144592601.pdfIn PDF document text
    • http://tayles.com/uploaded/84354826814.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/24400750691.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/56348105882.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_off0000e10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 18444 bytes
SHA-256: 60a7b73ad09def2b17d5938fd8b1eb7dc8f9f348a798b0f99b7b0f5aa34a7ade
font_02_sfnt_off00012978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12978 11004 bytes
SHA-256: e8a18a7e643e35b108064f97f3636ff46ade912459fcd896d894688668623b64

Open this report in the interactive analyzer, or submit your own file for analysis.