Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d6f8ea0c36f3b8…

MALICIOUS

PDF

102.4 KB Created: 2021-06-27 05:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6d3b3ce552af824f9c176356bb7b12ea SHA-1: c2f7b7ed03c1a658275fe71fc849ac945dacc7ce SHA-256: 92d6f8ea0c36f3b82d7392f5eb039eae0f3fb1abbc15f3a67526a3b2f4cd6b9e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be SEO manipulation or directing users to potentially harmful content, rather than delivering a direct exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 http://thuduchouse.vn/pics/file/rofexu.pdf In PDF document text
    • http://libertyquad72.fr/userfiles/file/biwisamugimado.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/begesaruruvinoseferagemas.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcef3a4b7d---64862551959.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/63718704330.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/690e73d4ec245635a1695ff5d3ac215c/1734931197.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/70195064096.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/dazodejajeretawedi.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607b186eee800---94407771392.pdfIn PDF document text
    • https://avenue102.com/uploads/file/kejexomogaxa.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/0cff9af2f26ed50c9f2c57cedfe09e74/22396852504.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ugibedutivovaxenajogor.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/belumu.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/35828547475.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e4699e106---nofutunexumilajip.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210512030307.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fec18c2611---lagis.pdfIn PDF document text
    • https://digireg.pl/upload/nofogivufekiru.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-25/20210625014855860975.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f2d5346c---51727056306.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zisuwizavaveputakupimo.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1607e94dae0ac7---33568968141.pdfIn PDF document text
    • https://stopserv.ru/files/file/1973947385.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/5dbd735f73db564b8c299d2493a55d8a/31657257305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+write+a+mathematical+modelPDF 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_off00012bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAD 18468 bytes
SHA-256: 56be8ee426034f368c5c6157ebe3e42c31bfa3b161f8db9542929db0b52a0c23
font_01_sfnt_off00015c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C6C 10440 bytes
SHA-256: 6210a3af0bb312f9cba5b774ce588a087cf1f11e09d30e0f24f71a33a1a016ef
font_02_sfnt_off0001741b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1741B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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