Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa203278c0271ca1…

MALICIOUS

PDF

84.8 KB Created: 2021-09-19 15:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4cec779bd92eaa2dd276a827fb488200 SHA-1: 1134e1e7c4d823d7d3c952d8dd446a6c0b244231 SHA-256: fa203278c0271ca191a332939f6ccfc5b98895760f9a050b079fda8bc6542620
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to other PDF documents, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the structure and embedded URLs suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://elcolono.net/userfiles/files/43864316233.pdf In PDF document text
    • https://perfecthospitals.org/FCKeditor/file/zefewofeg.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/nigizeliranovagiwetewu.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/gipakipiwobivunodawexi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/tutusegimuxi.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/13104622557.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/8182025175.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/27139575379.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210902052217.pdfIn PDF document text
    • http://atanasijornet.net/uploads/ckfinder/files/xetivifiletozoxedukorimal.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/88339590436.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/434b7350aa6a3ba14ddcc3e1332acb54/42408868670.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5a71c503---13208944103.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/namividadedigema.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/58898032334.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/67659805479.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/66585951297.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/pepuvafifovizuv.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/34478220570.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/83153976853.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/4dnpf39fupsf4bkft5d47imfm7/55141167012.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/gololotubotukidaf.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/mapene.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/90746782173.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/197530477461330ecc02413.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/nirozalokebegan.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/54902182299.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/muneloxeborelabudewisosug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=apk+file+for+pubgPDF 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_off0000eae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE2 16892 bytes
SHA-256: 1cb9d5d6f645990c23992b20e7d8385d19485b23b69ee0ffa0d7d16121fdbf10
font_01_sfnt_off00011689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11689 10316 bytes
SHA-256: ef13d4cd9453f8e3e5a7e6fbb57cf2e56d63c106032138301bb32af821056391
font_02_sfnt_off00012dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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