Malicious PDF — malware analysis report

Static analysis result for SHA-256 186449d718eed878…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 05:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 47f6f8258786a0880efd5ff57b4fbb82 SHA-1: 9aa86d1ab5636369a0e0b45d13c6ef87725b22f1 SHA-256: 186449d718eed878f84c6dcf2531007d45c0b5817497ffae61e56d83a4714835
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on disposable or compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an effort to obscure the ultimate destination and track user clicks.

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://palcev.ru/userfiles/file/fokufigubufegosom.pdf In PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e8541b6f79---pokadinetojimomirudolam.pdfIn PDF document text
    • https://senhewood.com/d/files/mamomaxufolutabuwixa.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/23733104108.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b6bd8bf2c---migetapafulitazetadutimi.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d2dd220e390ffd9c76a8b24de38157a1/14280337355.pdfIn PDF document text
    • http://unityproductions.com/upload/files/rinesiduferak.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/rt2b9aaqni3dku2nenl5omct3s/zuxobojakiw.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5847ca6d2---3242986127.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/46621039972.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/a10e24ecac4790d4e60602cdf503a757/14671769824.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/65339270307.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/04f91985dc12f762c27f87acc99f49c4/68292272566.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/vivigepipifakowuposuzube.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/kinigadugovomuwizuminar.pdfIn PDF document text
    • http://stpatricksreunion.org/clients/84553/File/10484100599.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f50f143030---74533641293.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160700994bde0c---muvoxatilofob.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/fc71ce051a852259198ae76e44953f4d/67552608698.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160de33f760cf7---93360233451.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/46655263381.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/52120185390.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb7335c40d---wuxavoredepadusuzepasa.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/vasowezeduxelibamuxilim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=was+were+going+to+worksheets+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_off0000da46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA46 10904 bytes
SHA-256: 2b43a94da87e7aa3d7d9c411c3eba391b1e5bd34a0805d3b79d0aa09a08abdae
font_01_sfnt_off0000f348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF348 17120 bytes
SHA-256: f316c4961343180434af4e97da97e31e1b4536ed099fb213448e5fc19b64df69
font_02_sfnt_off00011fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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