Malicious PDF — malware analysis report

Static analysis result for SHA-256 9edbddd1456f9d70…

MALICIOUS

PDF

67.4 KB Created: 2021-10-03 02:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 477a80cdf7c19c46248b8ee46e62a6dc SHA-1: 7cbfb14f54695885e54bcae3d25a0b16060070a6 SHA-256: 9edbddd1456f9d70e7474bed70bf50e42d8131c59b0d5a9715c1e2ee44174873
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a malicious screenshot lure, typical of phishing campaigns. It contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and heuristic firings strongly indicate a malicious intent to deceive the user into clicking through to a potentially harmful resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://dorrstrechy.cz/UserFiles/File/sifasegakutafivaxubuxenib.pdf In PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/45566e5d35550a98478ac38f7e8236ea/ruxosub.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/zinelalinidilelixe.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/36453467712.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/xonavudemuwob.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/2763029418.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/miniwakazalusopifu.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/36615261313.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434cf82d596---56086916628.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/dedekalonikow.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/4631426007.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/13330709841.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/80644902659.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/fuxerefidofezisejuvokol.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/lagamuwof.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/70334276757.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/77313336487.pdfIn PDF document text
    • https://angkagenap.com/contents/files/3684243151.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf96ad7c1d---39290102303.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/8665519823.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/58985328441.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/dupopawewuzotelobiwukejo.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/85137463904.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/61179830789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=hesse+and+jungPDF 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_off0000ad9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD9A 10188 bytes
SHA-256: 1aa98b8e5ddf79ec8b041e3e11e7754bf2324b2b902402b2a260d19b5e564d6a
font_01_sfnt_off0000c447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC59 14452 bytes
SHA-256: 04ffbf4381ad471c5d22d498c2fcdf48b0176619814aa8a898fefffb92f29cf3

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