Malicious PDF — malware analysis report

Static analysis result for SHA-256 191522774fc887d3…

MALICIOUS

PDF

88.4 KB Created: 2021-09-15 21:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6ad369938a0ff85e03e58aefbe0c06b2 SHA-1: b288ae78c97a7370e9fd447df6205a73a0f55481 SHA-256: 191522774fc887d3940c31333bc5ba855f7fc33e97c7a3092cce335044287bfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains numerous embedded URLs that point to various domains, many of which are likely compromised or disposable hosting, consistent with a link farm used to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://alaskaproauto.net/nbloom/fckuploads/file/bopiwosikupo.pdf In PDF document text
    • http://curvesncontours.com/userfiles/file/kunadefod.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/wetefikudufe.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/93179174490.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/2317196163.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/basisokebetatigar.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/52460601257.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/35654984234.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/64907218265.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/fibovelikomuxozojakoruf.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210906144455213.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/2b1eae077376a9467a8ac799c3f0aa54/24132223156.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/30585327727.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/52740082555.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/puvepolazuve.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109151424595513.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/11126491842.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/ketulupesirusowiliz.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/58527994937.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/2987574956ac604400caa08f9ea4c56d/wunutezamofedex.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/jaximebate.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/43830572314.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd91be0317---11685657374.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/52182105936.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/7340504358.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/ligojumukulana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=somebody+help+me+2+123moviesPDF 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_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 19620 bytes
SHA-256: 91cbe1805cf81f42eb3746bd8c35b808ee62b3233e98f4877d13b1e413745660
font_01_sfnt_off00012284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9B 10932 bytes
SHA-256: afe94729aeb63f122d31eeb8f7a73ece32ed9f9f2d2821dda2270ddbaaf1c2a6