Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31c29118334ae63…

MALICIOUS

PDF

79.4 KB Created: 2021-09-20 07:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aa132aca548fe21cd5fd197f16ab427f SHA-1: d8421d03c8558f4ac889d29b3bd9e891539ff711 SHA-256: c31c29118334ae638a35d378a04942b428ff937809ae97f65e1f1e1744a21c6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure suggests it's designed to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f461858836---30179368631.pdf In PDF document text
    • http://martonaroniskola.net/userfiles/file/43408079370.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/zefoliwoxibad.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/9885657230.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16143e4e7c76f3---82272696749.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/japanad.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/73481100129.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25083827667.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/44605919012.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161421f2e80ece---xelakozi.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/26152200151.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/tozawewozal.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d0329f259ce6475bfe2dc7371e97064d/82892597129.pdfIn PDF document text
    • http://chromavials.com/d/files/27973961250.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/lurav.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/62558963106.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/romusuxupabogefadu.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/4b93dd3870753ba27acf4b16809cacf0/votilosodipanutagedogab.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/58327958475.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/wisub.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/c2c9794a1ee34a5ae8bb6242915980e7/37278179401.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/zapevimeboji.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/16041184782.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/41494692836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=harti+igo+primo+androidPDF 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_off0000d00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81C 18220 bytes
SHA-256: 994c997204a11a189646953fe06ee6fb1f429c98c752cf8886668777afbbccd7
font_02_sfnt_off0001173a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173A 10380 bytes
SHA-256: ef679665e471151a29ee4b8fe6a9f3dfdbad2701cce718eefd8e30cb2890af36

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