Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15c66c4b45021b9…

MALICIOUS

PDF

85.7 KB Created: 2021-07-15 13:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 26c6f44821d848928da43a965ed5462e SHA-1: 32fd7622ddad17543f8e2c08d1ae47964ea77518 SHA-256: c15c66c4b45021b93aed7d7ee7a992e3beb33ab497159d92df3e9cacdad88e1b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to potentially harmful content or phishing pages. The structure and content are consistent with a malicious PDF designed for SEO poisoning or as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609176c808a70---43103200127.pdf In PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1946172136---78053441120.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/liwegupidufuri.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/wexanejatikiz.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/7n0j2k5meecek95p3g1o4ttus7/nuroxumupitosisipin.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/kegoviloxofokut.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/16161490626.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a6cfb5191011b3a280405ecd85f78086/letim.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd5df44446---26826175959.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b879bb4f050---xituboji.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/81714562213.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/44055550322.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804ccb03c3b---48095626210.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/072ef22b638ddf96af9e99501756beed/64668468570.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/61919301d66bb391553df00596fda051/bodibobarurokadefi.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6009df840b8f547f8cd5bbe3a9a64c5d/18396195477.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/60a72073b870ddce98a18fec56ffba05/18029713094.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a9528745d---kisemugurigenovobo.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/13d4430cbf6fe10597f87ae7a4a5f6b8/45989006756.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/9de1bed46d196b009f3c7354257f90ec/58596087332.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/a49a21b9bfc58090e227c3342f3cad0f/94144402735.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787de1a69d4---kavoguvomitamus.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/74746421226.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/mebifubaxezuwuf.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee39348c98---pagijekikadokebovidike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ringworm+of+the+scalp+symptomsPDF 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_off0000eb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10369 16920 bytes
SHA-256: f561cd93f83d33df8ab76e6cc786a5af5c2557fca7670912fedf1175fcb1003a
font_02_sfnt_off00012f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7C 11172 bytes
SHA-256: 62b394445edef26b0ef1b7b166a1db947ca824e342c15cda243f5c5dd4ca2ca7