Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d6e4519eaf100d…

MALICIOUS

PDF

112.1 KB Created: 2021-07-17 16:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aed3910ee5be551b0e253bae770a8dba SHA-1: ad7a091f9a256f1727023c585adbc1a839c0a38e SHA-256: d4d6e4519eaf100d2437fb9b1136f9c582d1aed44ae6989ead18c8f69a051b98
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The heuristic PDF_RANDOM_URL_LINK specifically flags a link to http://developmentassociationofnagaland.org/nbloom/fckuploads/file/61655590758.pdf, indicating a likely attempt to lure users to malicious content. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://libron.pl/fckupload/assets/file/41877361895.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8095td0ldisnkl6gsisnfg5j52/50162599925.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/q3kf326a4a9lrmait6u73achrj/dunoxubuludotemubamo.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/8cac7218971af96ef9d009057192cf07/76962380241.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/22489618908.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3d5220ae2---56385050466.pdfIn PDF document text
    • http://vhs1970.com/clients/873287/File/27878493584.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/perubak.pdfIn PDF document text
    • http://short-story.ru/upload/file/vefepepawogelivememom.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/61655590758.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19e44dd88f---53858296892.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/23580122169.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/e9cf070c637214f571601ae729ec1661/74187826260.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/6dff3f86a613490eb83bdc009d860501/98200652817.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/52545289720.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/13012299974.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086b24e41212---64558680191.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160779faf8ac7b---11474260889.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f9f483c3b---fudonigagov.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c8c803ef69a1eff984aca410e6a5f01a/javokitotu.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/65681417406.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/64061943824.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/75799850092.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/wezuzadikisufuxufuvus.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/010ce068603a2c2d227dc4ebb29a406f/73333960069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=rummy+in+the+deckPDF 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_off00015a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A69 10392 bytes
SHA-256: 344df1778cb08416dad0aa2bdc90444ae06c4c2ea52a30f3b9010c5942e5259a
font_01_sfnt_off000171b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000189ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189CA 16140 bytes
SHA-256: 127619418056221893e92eefc6b206ea29fbebf06120ecc8804383bada4c9bbf

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