Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef9ec78e0482a78…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 16:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9677a73c42e4476e9c1d81a153551248 SHA-1: d7368bdcd89bdf9068e0038a0687cdd06208ef9c SHA-256: 5ef9ec78e0482a788df0833023140feae950e15c98f5365f421ce09cb987d59b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards exploitation of PDF vulnerabilities to redirect users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://laborke.ru/uplcv?utm_term=mirror+phone+on+pc+via+usb PDF link annotation
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130c749741ae---kigovamaxovorugemeweka.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/90004669303.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/9qkae0j0lh7mpim9qo0jqjoi49/mopaliguludopezixobobepet.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/gibilisawiduk.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/9500087673.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/vakovova.pdfIn PDF document text
    • https://emenu.hu/editor_up/zorifuwajefek.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/70fd5a2565785cb95a59d1a73d54fc18/wogaxevepaxafutesawi.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/h3vk7oaoi4k0hhfecv678cgv6e/figanad.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/89826663720.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161359395146f8---vovip.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/vesazubesegisalanizuk.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/6757a1a44fa2be23e219588bd37a0da9/54997310173.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f12242863a---50545276821.pdfIn PDF document text
    • http://handgun.ee/media/file/zifojonolipupa.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/wadumilawegujona.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b52be147dc---34408357872.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/25186828406.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/novigorif.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/javekaf.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/tilufopegovuvifipeni.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_off0000dd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52B 18280 bytes
SHA-256: 587967f70eb5d1c3ea09f466d3d11beb9765d167bff848c3a59fa3b63193f054
font_02_sfnt_off0001241b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241B 10628 bytes
SHA-256: 83d231efa2482aaa391fc69c59bbd6fdacec5cac4d19feed0260525cdf71a9f1

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