Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12f975d4f7ac9b1…

MALICIOUS

PDF

173.6 KB Created: 2021-07-08 03:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 5074ee9e64ad046d9d9783f2590a0114 SHA-1: 129370ca8459f65bee1cdb4d4d1892b321516f69 SHA-256: a12f975d4f7ac9b15e1eab5d6498131986b31c1908f5bd0e5d6e4afa5b0539f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://irlanc.ru/uplcv?utm_term=quinn+ethics+for+the+information+age+pdf PDF link annotation
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070f1cb89405---sejujekedaziwawomawurij.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c102c242d7---684236844.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/marudomoja.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/324ca8b4ed78c4abb6bb4f7614265f49/37914602920.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080862e06183---balonebikemenur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944ffd4c0d6---95619280696.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/33597470801.pdfIn PDF document text
    • https://educhina.mn/editor/files/28830542689.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e284ab7bfba---xomerukuwos.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/88208695912.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/qjk6s5ppj736st03phl49htpse/xasisodiwazexobelovon.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b849dc4b833---gakilufulul.pdfIn PDF document text
    • http://rurisnet.org/images/file/jigipupovalo.pdfIn PDF document text
    • http://roocenter.ru/upload/file/76560766402.pdfIn PDF document text
    • http://hogan1973.com/clients/d/d4/d4eda5e2427b34f3a15374adde9a77da/File/talogotomupune.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16234952181757.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/raduge.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/banopajorida.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/9848601cc1d325bef7fc673ebadfbca1/bomameb.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/pakajatuvur.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/romudo.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/duxidadowazuj.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/0sg7rk1et9a71vnqs95uuu8ujg/90011603209.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_off00024285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24285 19280 bytes
SHA-256: bcef787c68c6b04fbac5b467b244262950783e5c3f1c3a354b2da07b90ea4e8d
font_01_sfnt_off00027532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00028d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28D49 11180 bytes
SHA-256: 6db8b8ef53f9b8b411ac7c31bd6bdcacb287acc4c2f371dd027e42bc85aabb73

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