Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a992a46bfd7a9e2…

MALICIOUS

PDF

86.0 KB Created: 2021-09-04 15:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bfa2418932cefbc1e219b04dd30c9051 SHA-1: 2c247eb4622ec8d27dd550b2a59d913747025791 SHA-256: 8a992a46bfd7a9e21954d84bc067ad7794ad861a4299abf2a9b98c18e41f5237
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, but the presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the link farm nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160868e4399e42---56349563764.pdf In PDF document text
    • http://doo-san.com/userfiles/file/20210705151011.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/xaruxeja.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/5781023181.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/xiburokabiwalapu.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084cc0c55f42---betofizoromazu.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/hjeqhphrulbh1rd1gk3f7rn8ts/34477230100.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/80911788843.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/lofapubojikavofonexelavo.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b0078aef5---xonadopa.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/89546972625.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/5435606773.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/9227046904e77bda6a3f3f1ea3765143/xowepibibifelawidode.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/jusemewuvonawovajaguf.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/8d9236142b1972190530546ae92ece65/lajefafav.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/72c1261112eba1ace19efa5add806cd1/ruxavuresunit.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098280b8b0f1---38637828644.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/xopiluvovugirejuzef.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210720_6F06D07C5775C4DA.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/nuzegegi.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/wafizozekoso.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe32e2aef8---87253985158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=situation+awareness+training+pdfPDF 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_off0000e7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CD 19280 bytes
SHA-256: fd6fd5cc7f5d855449e9cc1b3cbdb8a4427328da6da6d0afb11c7ad832387deb
font_01_sfnt_off000118d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D9 10888 bytes
SHA-256: 5bd5c4e5d4742c164a5d0f2d3794a15faeaac261ef8010117bb542dbdd98c479
font_02_sfnt_off00013203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13203 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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