Malicious PDF — malware analysis report

Static analysis result for SHA-256 c437ba0a4d9ab5c8…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 06:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8ba03363903db518ac5c318e0912e5a0 SHA-1: 4969cf2687098c2cfce90ee2da3fce11a550031b SHA-256: c437ba0a4d9ab5c819b609616be2cea09e1c36edb6f408c388b776391366e9d3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and is structured as an image-only document with an action trigger, typical of a phishing lure. It presents a large number of external links, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 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.
  • 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://pacie.vn/web/uploads/files/65406448485.pdf In PDF document text
    • https://sma-dfgg.org/site/admin/file/lagapumixawowuwisonun.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b62103c0d4---63106344213.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/73995098513.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/15233124950.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a61475d2---67346247443.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/35796771130.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/wuzedezubegudijinujeg.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/5571306968.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/58854299080.pdfIn PDF document text
    • https://netpage.info/userfiles/file/29648819374.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fff14c117d---zutopesole.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/kemekisasaxijumoxejadeg.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/lafitalerutobez.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135114ae2618---90281968518.pdfIn PDF document text
    • http://erpos.sk/data/files/74447890639.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/bivulikutorovitajeneno.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/88534502635.pdfIn PDF document text
    • http://kasand.com/userfiles/zegugusokuvokinom.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/gidiketolixodadalaru.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/gokenido.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/bifamowutolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=dream+league+soccer+2016+video+gamePDF 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_off0000af9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9D 14176 bytes
SHA-256: 5b7a5e31c789966d6028c5573d96d61345b70c8b0b71403f16beb8160a529b3a
font_01_sfnt_off0000d29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29A 11140 bytes
SHA-256: 4732b3fb1186e11da2506fd0196686e1b02996d752746692835fdf102dcdf248
font_02_sfnt_off0000ec87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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