Malicious PDF — malware analysis report

Static analysis result for SHA-256 043d86932677103b…

MALICIOUS

PDF

95.2 KB Created: 2021-07-14 07:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 59d6e2a9752342af3145002503a0248a SHA-1: 437276465b39c47d8a047f9ac29701938adc0a65 SHA-256: 043d86932677103bdeb9929a6799574c413555a3062010cb6c5d4945210e183e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall structure and URL analysis indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/vgnuuq1j813cbnlenlasqknlh4/tazutefurikosisunezi.pdf In PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/2ebc41ea994c8c48af7ec1d2968df51d/73831953081.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lodelejojiwi.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/4d84024a9379981f02d9a9a93c65b4f4/kiperegonideru.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160de099481982---54852138645.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/j6u5mpbf2h1h9e28i4ajv0rgpe/tevakezef.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/1e9dd1b8b4ba3db418b4075f6855f09a/41242788371.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/feec8218b4b0dedb72dce9f2fdd32d2c/jodovuzarezezag.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4b6ed2afb7aaf75c346d572fb23294de/82729064607.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/gusozur.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160758c4a328ed---kivujisumajig.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/panarugoremiguzigavotosen.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/xiduburajigijebozafije.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/8ooh7dh5u1ljj9sm3h46hu8uin/94028328319.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/49278566491.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8151e630d---78165964330.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dcac17551---jikaxilodedemujirajuk.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a8baae3ae---10593048276.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16239518809032.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/750677f7d8a5ce48c628f07162d08f1d/tokomidifazolezor.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160881cfd5219b---xurebiwo.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/ruvobemafojujujavopoxi.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/516f679tfu37uu2ou83lmgdkk1/93839196751.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160865ad68d36b---tiromodifob.pdfIn PDF document text
    • https://gangnampools.com/contents//files/60725656003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=poem+about+online+learningPDF 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_off0001133e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133E 10524 bytes
SHA-256: 1519aaacbd5f9ff0ec9d79d45adc8169a2fc2531275655f074a86f2f06f66507
font_01_sfnt_off00012b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1C 17084 bytes
SHA-256: 132ceff980b0627d07bd48fd6f5cee31245f2664c6453cc4ca719e058ced3ae0
font_02_sfnt_off00015783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1