Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ecc8c7c2dd44b0…

MALICIOUS

PDF

81.2 KB Created: 2021-06-26 00:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3b20a90168d77eaea65d16753b80143b SHA-1: 1e7c9726b0614479372b87140ced38254476789a SHA-256: d6ecc8c7c2dd44b034935b4e4f200ef2d350242d4ee91bc2823ec0a700df19a3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://vdadanang.vn/app/webroot/assets/files/26164778194.pdf In PDF document text
    • http://digemnd.com/UserFiles/file/97988630207.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/81259445009.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/luzinaw.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/53507078543.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/49189027116.pdfIn PDF document text
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/27546570898.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c8715d7ee---49444471082.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/rover.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd255cbfe2---46088259776.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/8k36h3gtdp71hgitdfd9tle3e9/93030635312.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/29158916547.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160848b6462b1b---90583499317.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babbba1f5d0---sazalazimojezamu.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/8258863781.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d218460f7a---62115189851.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16cb58a9b---wevusesozekejew.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/8afb69500bd5babdb75c7eca796dd8a2/95808455821.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/214704902.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/lezixoxupowo.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/13245269295.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/59443626491.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/22362560178.pdfIn PDF document text
    • http://3will.org/soubory/files/56517188813.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c967c4da4ca---75972982587.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/gekonanale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=norm%27s+white+horsePDF 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_off0000d99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99A 10156 bytes
SHA-256: 75724603cb20debe60e8d9f3496b8a377fb02098e95576cbd52eab805e618a15
font_01_sfnt_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 17780 bytes
SHA-256: 6d4b322fe44f9516c0a6ee9efa8ca77058bc4258421b835b58023d0d7ad6f4e6
font_02_sfnt_off00011f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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