Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d42dcc29fc3158…

MALICIOUS

PDF

78.3 KB Created: 2021-09-04 05:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f7d53e3351c907767e760cb75772519 SHA-1: d1816d9de9b7b5b13ffc8304115e87991dd7426d SHA-256: 74d42dcc29fc315874a8d56f4f21b373d007bf4057da6cbffb8abdb0828c2dc4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, indicating a link farm or phishing lure. ClamAV detection and ML classification strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and URL analysis point to a malicious PDF designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=types+of+computer+registers+and+their+functions+pdf PDF link annotation
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/l1nj59d4j3fcqlf8qgfolo7ce5/35308673381.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/692654927.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b97e64879b1b6438f95b42b0b618cdec/meperesinenamup.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610a2acd0f9d0---2689018293.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/f06a79713cf19972b61cb5f0077fce28/mimemalenijizabipinupat.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/73739121830.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/17174979466.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/97806058140.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/dazajomodirunamupemex.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/39417754304.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/tukajikowetogekofikixufog.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/rva06k2ksb1ss72sjj8m82ram4/81504629965.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/neluwikozutowugawuludes.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/77803041081.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/57652218443.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/dapezebogodolunu.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48f80eedb---siviwipogime.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078f1f8d1be4---gemepunuwuvojulizejozik.pdfIn PDF document text
    • http://apvn.info/userfiles/file/wozibobiviposexeto.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/56403559659.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/25909982231.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/45325963002.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/zukugomisozavoxiwojo.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/20490069568.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_off0000cc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC49 17212 bytes
SHA-256: af38d07b2e6dc6ca038c57b2000c43f3f83c48a021f4d7d65b2389c2b2342d68
font_01_sfnt_off0000f8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EE 11200 bytes
SHA-256: 1b19c94615fd778c42b18b4901252f1f81eab680e2c1200d2b55a32d6b5ae88f

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