Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d1afc0144210af…

MALICIOUS

PDF

84.8 KB Created: 2021-09-03 14:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 792f0ed06ec251603aef98b6d6bfe8b0 SHA-1: b58a504901e30a75ac4bffc98fd309fad7a8aa10 SHA-256: e7d1afc0144210afa1e39775f729e4bfa38d073efb1c9876f1fe5b2dbf0fe19c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable domains. These links likely lead to further malicious content or phishing sites, serving as a lure to trick users into clicking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://sweed-trans.eu/ckfinder/userfiles/files/biwelenakesug.pdf In PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39a2039d73---xatibibavuz.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/34cc2ebcc2d84cefcd9253ef7024faa0/pibimo.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/36250511641.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/62106392631.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/30701480736.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/mupejiposagesofegozubufi.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ith6hb981m0j2uonns2d3hdi7m/11475952386.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210629064403.pdfIn PDF document text
    • http://geose.ru/userfiles/file/vuxofomonifijunasiwanut.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/15824686616.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/11ml0q8pbc3mdk2ik2enpgqfk7/vipibejixupu.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/rebolifibag.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/weranow.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/87613476701.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/85d9e5e1746a761514c0b328b2fc4d90/20951335326.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/sapowewimu.pdfIn PDF document text
    • https://cubic.is/userfiles/file/83060506077.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210813_102713.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/budegize.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/wugovonokokawoxuwobexon.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210528_110137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=servo+panasonic+pdfPDF 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_off0000e089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE089 20212 bytes
SHA-256: 97774ce62a31640fcd729d24f955cbaef2d97ebed187c8ec5b6a1beb25f09c83
font_01_sfnt_off000115a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBE 10608 bytes
SHA-256: f0fa1c037f7da7e231d67ff0e46a30ff3612987f47e87f24e3ff04c6e4262ea2