Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8fe46287f3f565…

MALICIOUS

PDF

100.4 KB Created: 2021-09-17 21:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dfd8ff7df7578bed39c31ea51b90fc74 SHA-1: ac2d6d3771302abc359063d286e8fded2eca7cf5 SHA-256: 2e8fe46287f3f56572d3b92477bb29f889e41e7fc18126ad7e7a733b8f118b17
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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 https://retrofitoman.com/ckfinder/userfiles/files/xatutejorebizepo.pdf In PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/63877801990.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/95529108950.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/2953290933.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/32078608009.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0b2cc4b57---44727048595.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/35028575088.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1866715e8---givakusuzub.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/69896670073.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/71094130685.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/20303357060.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/61098417671.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/83139703834.pdfIn PDF document text
    • https://equinox-e.com/upload/files/nepifunoroxobedi.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/4068299402.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/lakoxurosusa.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/69747945434.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/15071644419.pdfIn PDF document text
    • http://dkind.net/userData/board/file/46776576206.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/lupibeji.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1d44ab338dd3f3a3aaab474ee48f4351/50627442813.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/xejajofevuton.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/jojudadudogin.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/telijaturugesujifovunul.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021091618533712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=sankarankovil+theatre+today+moviesPDF 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_off000117ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FF 10860 bytes
SHA-256: b7a28cc18fd6fbcc9aa7ff3f9ec23312ce6130709c6dc571f7b77794e6718de7
font_01_sfnt_off000130e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E2 18108 bytes
SHA-256: a201b0b3349c5be59ab9e6d2463564ec2fd9f02ddf8bc7b5a165642fe9015d86
font_02_sfnt_off00015fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000177ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177EF 2480 bytes
SHA-256: 8afa6d3d1b8150fa47f7af0bc79e0b45731cf3385cda1dd8ebe6d16763863fc9