Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfa57bf965ce986…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 23:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 94a97b3ce36e12facd1a9573d0ede4d8 SHA-1: 0c3cc2e307caf2e803b6e522edaf7c23c869364a SHA-256: acfa57bf965ce98665f810eb1e8a4c758bb8cccbefb7be54592f2f79a562f08e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pixomot.ru/uplcv?utm_term=symptomatic+patients+meaning PDF link annotation
    • http://suttonoakfarms.com/clients/880813/File/ruromefoxaribivaz.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/14005930969.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/36143847255.pdfIn PDF document text
    • http://thediamangroup.com/_images/files/xejezoremidaduzupipevu.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d0b33bd3a---50744575668.pdfIn PDF document text
    • https://ubranni.com/uploader/files/20951845948.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210828_051624.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/kededusenasuselapesuxekip.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xabunulikiwasax.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/75403340839.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/kupanexitar.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/letigaresawin.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/66391648519.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/56064979667.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aeae032c67---wogakadisesivuz.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e85b24a5d---vokaroxuso.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/d46b82ea2538bad09fce5d68026c02f7/zemomiwedopinonir.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/96770070881.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/85111680286.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/32651168085.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b772916233---38429728152.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/dutazorupudivu.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_off0000da7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7D 18244 bytes
SHA-256: 70b7a1d588d34dcefe7a9f87f7827ed4f687014ea13d8294289c839f944a0c21
font_01_sfnt_off00010870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10870 10760 bytes
SHA-256: f5d0aab460392f4c5eb71c55573a4254bd690e555ab5283ad3c2d9ce5ded353d
font_02_sfnt_off0001213b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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