Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0ea7c8ef3fdb4d…

MALICIOUS

PDF

82.7 KB Created: 2021-07-19 22:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9f7dbc4288bf2b2a8cecc2146db1277 SHA-1: a526a4f63aea5d07b609793e990a324e4ff93265 SHA-256: 4e0ea7c8ef3fdb4d3e2d78bdad4e0ecdbc5b97d59288e74ebf31352c29fb21e7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://crackershrimp.com/file_media/file_image/file/42727527736.pdf In PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/up1arqjvsqc644p4g3m6uejjca/wisixulirilojijadojulow.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607815bdb0d21---xadakejadujuxezasi.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a97048a67ca---62906709619.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086c4fc1bd28---zesugasukavijuwuju.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/tagejuxasub.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/p2giaasolaip7r12heevc95vve/zudisuduvokugogilofafevi.pdfIn PDF document text
    • https://bursac.net/userfiles/file/noxedagapasit.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ralifolotuzopajapudodot.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/mokibajox.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/wunizabasu.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/sijamezeluviruninaxag.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/4510431171.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca2e9edf22---56211200390.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/gisubuxepuxuwugow.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cbbdee6d2---42504045499.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/datugebu.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc04889dad---54567876462.pdfIn PDF document text
    • http://collegedelunion.com/clients/76066/File/41064919981.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e671ea08c6---wujosuletop.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/m870er9hsjl3ha3cc56ghlimb3/lanomosesoxumigurixemo.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/71632201969.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b4731060de30fdadf72a9483cfeecff9/bifurizuxupevewuwuxurabiv.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702e6e0aaf4---zametekabilogegodiviw.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa99b6578e1---68257153987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=coby+and+helmeppoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77F 10484 bytes
SHA-256: 6ce3e63c281e365818433cdab7952f7c7eb4df052b18ab6e1ed9b8fb25564176
font_01_sfnt_off0000eeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F7 1760 bytes
SHA-256: 478d64aad58a46c60a63c2bd6d05d9c39068b35528f549688063ac651822ff24
font_03_sfnt_off00010f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4E 17396 bytes
SHA-256: 03f95700acc840898d488f06559a9a4f8af0965030c270d76ef30e08a02d62cc

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