Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c2c6147841175f3…

MALICIOUS

PDF

87.6 KB Created: 2021-09-04 15:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5434ac84785910f7c79557bb0d608251 SHA-1: 726acfb7f98aea37648b6e4c5962600a2df7a788 SHA-256: 1c2c6147841175f3b2bc298fd48a43fb9ee981c98bc540e6106f9e947badfc2c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple domains, including compromised CMS uploads. ClamAV and ML classifiers identify this as a phishing trojan, likely intended to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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
  • 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://garglob.ru/uplcv?utm_term=cutepdf+writer+free+download+filehippo PDF link annotation
    • http://www.nena-artspace.com/ckfinder/userfiles/files/vibukevapenurikunur.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ce61b75574e8fb2398e36f94964c63d1/keguwudilen.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/uudghbo58hmgd1roa5egnq28a3/sojikobamutixumatof.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/94059575477.pdfIn PDF document text
    • https://maria-galland.ru/files/file/20449224384.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/fokoxaxumifunifoto.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/94168076049.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f16c2f5a9ea---51132141670.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/wukitapupesisasubasaxefel.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/81417560026.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073df851f6f0---53542120522.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/81d8540dfe95ad246ad0ca6cdf2e1d66/96751071395.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/pirutikigevalisotenawa.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/68933802ebd54e9a06a96e55098cc546/favem.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/93aa3b8f21e40605dbad374a6fd097fb/bijixub.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/90559168810.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/lidowasava.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b136e144376---zogetir.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/49494460456.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/7954328927.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e14bc26ff5a---54311738770.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16107d3e49da84---semamuvusupunoxifesomax.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000eee8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEEE8 18592 bytes
SHA-256: 6b7ef7ff3fd7e3c698d00c486bb3f0316257a3c4945dcc781935d656ff3c4e77
font_00_sfnt_off0000d6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C56 17000 bytes
SHA-256: 6e2dd5aa0b365435b77f1dd3b01caf42c17329e362a31333fde54af0410b1866
font_03_sfnt_off00013836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13836 10644 bytes
SHA-256: 13377b209c6f5c344f481572ef7dbb5fdc26c1c3b7f2123019c52f8301162045

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