Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd37d7193ee593a9…

MALICIOUS

PDF

92.7 KB Created: 2021-06-25 14:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 678c480f9c552283b02ef0d7997d4d89 SHA-1: 42fbe424a2fa2cc39f533344d3816e403070e51a SHA-256: fd37d7193ee593a906766caa06655b2c08b5ee1ab8dadb3ec17006268a58f983
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. No scripts were extracted from this sample, but the presence of external URIs and the ML classifier output strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=sweet+and+sour+fish PDF link annotation
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b732534e144---koveb.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/34844518224.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/82bg6cibbinp2092bknv22ilsh/6018282127.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f106359d48---tufefasemopa.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/74241786022.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/i7k5qbdte18b62937ul5el504n/wenaroxuwuwixiju.pdfIn PDF document text
    • https://ancoraeducacion.com/images/74561624975.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/vjnc0l1lofrru8n9a373hivo44/dexulonanuseganisila.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/29163758126.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fa40a9e97---tamodamoju.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/mizedetukawi.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609582e6425f9---zesitidarofuxifepotik.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/lexugopufikasamefoka.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160acaf5e5fe22---44961927730.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a453683766b---fodisiretukidusap.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/xunasuw.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d65aaefdd8---ruxagawogawew.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854a23bad8b---2751754344.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE646 18812 bytes
SHA-256: 52aefcb6ebe0fb880562a57b84f885ade92c69f383e0524220955d8486aaeaec
font_01_sfnt_off00011558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11558 9640 bytes
SHA-256: 7733630bbe3c5929f9cfe8a84d96efd820ccd333fec75f6b98438c3c3a5f0c30
font_02_sfnt_off0001338a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA1 10668 bytes
SHA-256: ac26092d5d094c3ca1751c375bb0a092a62dc1def7eb1c751c217a32804acdc6

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