Malicious PDF — malware analysis report

Static analysis result for SHA-256 b306d69eff4945ab…

MALICIOUS

PDF

87.0 KB Created: 2021-08-26 10:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8c0830f340c306801ddbfe1c42c11f2a SHA-1: e2a0f7159f2623fff944137b7c7ede3f75a036c7 SHA-256: b306d69eff4945abada3e2cbd1f8d63621eec4212a1b06e4974ab9a5aab15593
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content or phishing sites. The presence of external URIs and link farm characteristics points towards an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://oniceh.ru/uplcv?utm_term=free+direct+speech+examples PDF link annotation
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e3e799321b9586303dfe348eb8affafc/pokul.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/jazivepagiti.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/620dnol3ag9j755brah9k13977/tawizixewetaxid.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/gitok.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/kumezanatudumapokesazad.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90ea1da6fc---majoxu.pdfIn PDF document text
    • http://tayles.com/uploaded/wilevebexo.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/5q7m293o9nke2qaqoaf5bap6bj/8564193181.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/9109a2b1ffd64e880c239c2d3ea902ee/tewasenisabifigabugam.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/u59tgrl76uigi312eat2bkqh87/zemusak.pdfIn PDF document text
    • http://mrybalko.ru/files/40087774236.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757ca71fefe---82574396352.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/imqhk1f0b30ak4ckgt956mp2a3/42388761168.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/64241672460.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/wojotowifun.pdfIn PDF document text
    • http://learningkey.org/userfiles/67954035059.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/3fe4ae6f59016a1817223b095167d520/bidikigafatadukaguso.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/karer4q2q3k28jmqmspnu5c552/wefakiwif.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4f6448bcb---meneravegukigubunebe.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/76763864953.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/xuzigonigimisofagusifus.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd39007bc3---zipero.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/weludadutawuwape.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///92189857092.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/jupekat.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_off0000ec1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 19408 bytes
SHA-256: f945f79b39dbdff44679abf8a566d43401a78ebf23c5d1f5e856184d00319ab3
font_01_sfnt_off00011da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BD 10636 bytes
SHA-256: 5d3fd022da803d7bb484198eaf765d0120ff60851f53dfea2256b3f2ca57fe9a