Malicious PDF — malware analysis report

Static analysis result for SHA-256 972570cdce8c4738…

MALICIOUS

PDF

79.9 KB Created: 2021-09-02 22:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d68693cf62ce6dfce067ae014a416d97 SHA-1: 308a349d1ad07d3ec5f5720a303a559942b6159f SHA-256: 972570cdce8c4738315b5c110fd52e26f08097008ea1ee57d7750826ecfb34a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for information. The presence of embedded URLs and the nature of the heuristics strongly suggest it is used as a delivery mechanism, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://inwebjor.ru/uplcv?utm_term=fireflies+piano+pdf PDF link annotation
    • https://skinrepublic.vn/webroot/img/files/wuwularofopizi.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/88283295288.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/54227448365.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/bizujimumabisiwupevowuz.pdfIn PDF document text
    • http://fourfoods.com/images/files/jisogetudujizopefu.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6438312a1---wajokel.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/23872038611.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/rejorikuluwoveda.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e6c53b91e---dajibemobemesemejirejano.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611efaa0a7158---64806079889.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/70297167465.pdfIn PDF document text
    • https://nusbetaja2.com/contents//files/67618791311.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/zixiwidolorubemusixo.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/amlqsjasg5ke15ddc5tf44mnjk/jiduv.pdfIn PDF document text
    • http://kasargod.net/uploads/file/83262978679.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/33670369316.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1ad7e2afa---bagamuvul.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/89509214883.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/1913a6a4037d083194dec921140b4086/26601538223.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161171570a8c3e---62705659508.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/72906452508.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/64584451257.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_off0000d595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD595 17552 bytes
SHA-256: 5bf0f73f5090ff5b9e9de0d3dcfd771beac22a2b5f95fbf145aab4817f92d940
font_01_sfnt_off00010326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10326 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3D 10372 bytes
SHA-256: dc43ab3924cafdb8b9ecb1201ab39e918cf9e05f9cfa6b4468fc69924893a547

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