Malicious PDF — malware analysis report

Static analysis result for SHA-256 903566bc6d9ef1de…

MALICIOUS

PDF

84.3 KB Created: 2021-09-15 05:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: feec0d17b0c525cca8bcda36520c5554 SHA-1: 5d62613d500ec1a00f81508d3ce56e352dd82996 SHA-256: 903566bc6d9ef1dee3192ab00596236e4174d3c0d4709b86a70de8499d41de82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to direct users to malicious content. No scripts were extracted, but the overall structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/67500071018.pdf In PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413e8381be9---fisubaxiwejogarifofuloted.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/23127791498.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/7cc013c14dcd3fe61f1e955c8f68c789/daxarot.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/62140568635.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/roredabipunurusivojorune.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/5806909410.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///purazolanejeme.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/18193066720.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/344a9a111cd0f3e03ed4fe15b95d170d/67048188522.pdfIn PDF document text
    • http://djpress.pl/Image/files/zarojazidojotivo.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/vebiferitelororuzosote.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9facee036---94211008314.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613853d4c6821---13129192658.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/videgumigadijakan.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613817edd1b17---4866572308.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613239c7d52bf---juviresokiten.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/gubizozejum.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/63209311924.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210905175117.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/17147357563.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/notiz.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/77183005251.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/485ff2df71efe2d5b308d89da596b2eb/mebutavonirodudoniza.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630579127.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/tugexovebagatuvedo.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/56640475247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=restringing+nylon+guitarPDF 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_off0000e343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 18440 bytes
SHA-256: 72ebb78542db8e7ba54acb1e59d0d5e29985d6499d9d067a568a95fd834b6867
font_01_sfnt_off000112f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F9 10540 bytes
SHA-256: 2b31e988e7da5d78fa6aea0d37bbf4c08308d647328015694fa1f4ad3363cb3c
font_02_sfnt_off00012b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1