Malicious PDF — malware analysis report

Static analysis result for SHA-256 0803b743fe2fc5fc…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 15:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 67b1ef7a4545722b596317997bd4605d SHA-1: 2d18c63c595d504b317c5376fe5eb3e6dc3c4509 SHA-256: 0803b743fe2fc5fc0f9ecd8546f867e6e3a5c90dfb99dd9be929f7574070ad0c
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary purpose is to solicit sensitive recovery secrets or private keys from the user. The ML classifier and ClamAV detection further support its malicious nature, likely as a phishing or credential harvesting tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/e9dcadf02b41a12d7c89a7eff9c3c4a2/wukukenobukodixaxu.pdf In PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/93bdc22d54533530af672e5cd122f943/56472221681.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/pemamuwagibife.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/84277506419.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/34695032909.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/42273108689.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/zosimobulo.pdfIn PDF document text
    • http://eternoohydro.com/d/files/lajuguwelukoli.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/femofemu.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/87269936713.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611956685c584---7219029885.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/pirugilotujosunoxopisir.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c88550aac05---bewebupo.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ac0238429---29758179177.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/gedewadadebevove.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/56617040637.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6416f13bc5---68077568490.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/po2qnqr3bss8htj5tuch2dqq01/34194204174.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e644844b752---74540448226.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/lukerovub.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceac6ba496---74288892770.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098defc4a38c---neregasesavose.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/krfuvgb1ccou900oipqpnf2hmk/zuweratabofamekadi.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/32357348264.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dae688ef1f---70838897928.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610294d021879---sonuzafitofebuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=polycythemia+vera+treatment+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_off0000e5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CF 10896 bytes
SHA-256: 00532c0b4cfe03a9b32bc207fe05a6bf7c9631c23fe2d2abb831683d864ca0d5
font_01_sfnt_off0000fee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 17644 bytes
SHA-256: 97c7de7a2b73aca916829af8bf3293d8d5a7a31f0f2093158ee2e277284212d6
font_02_sfnt_off00012c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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