Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8b151ed65c0675…

MALICIOUS

PDF

78.0 KB Created: 2021-08-18 20:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 44262e9eb5a12f70533d85f2489bdd69 SHA-1: 3dfc43f8892d27fd4969f33c78038e8346934c44 SHA-256: fa8b151ed65c067533ad6e413e46ad706eb91b0040488f5b748e73b4bd204b8e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many hosted on compromised CMS uploads or disposable domains, suggests it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with the 'Spearphishing Attachment' and 'JavaScript' MITRE ATT&CK techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=verb+phrase+exercises+with+answers+pdf PDF link annotation
    • https://unosms.us/userfiles/file/27111330333.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/69351c72ff2e70eafdc2508d3114412f/jikikefulapisofi.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/57f009523dcecc333a0d74bbce9601b4/13052515075.pdfIn PDF document text
    • http://pusulacampeyzaj.com/images/media/files/vorezuwowifoma.pdfIn PDF document text
    • http://85097781.com/upload/files/gozixeneserifewarusup.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/89300337254.pdfIn PDF document text
    • https://777mto.com/contents//files/sunazalejupatifoduraruvu.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/85395713696.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/7047066365.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f7b3103ce---98097896847.pdfIn PDF document text
    • http://ore-processing.ru/d/files/58558222460.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088052408ed9---47244028756.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/888151696.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc8550ac36---25200834142.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a3767347bc9---wivavutimusaxedoxize.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/mojexavisu.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/nadewidizaduluzofu.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607d37b6e9fe4---masekijive.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/logowaze.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/sifuwatosutaxuv.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0957782783---bixogonipewigejago.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/f2d0c45dd959bfac77f68c113044d83f/pidamironigif.pdfIn PDF document text
    • http://93564497.com/userfiles/fabolasofufomujoja.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_off0000c91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91B 18564 bytes
SHA-256: 4885602ff8f44e00b523212acae3d848053bd8858c2ecb665daa2ed5a5a2f887
font_01_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 10848 bytes
SHA-256: 820fe8bbdf7930d50e19e312d238492267e867a93e8060a2a91ef6be0cdfc74d
font_02_sfnt_off000110e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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