Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3915605f49184a…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 21:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 67ec5ba239662bd0868b37b05183615f SHA-1: 528e341fff7e0fa30acee7fc5a6309a405287d3a SHA-256: 5c3915605f49184a48d21a904b170bd4faf86b49faa9c302ae36512325b7a817
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.bevillelecomte.com/ckfinder/userfiles/files/togefutorikiwajavaj.pdf In PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/33960acb092bd01bfa31a3b93e7b381b/mewunozumisakorudu.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/47046742907.pdfIn PDF document text
    • http://napiarsaigh.com/images/29027070608.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/doxizulilokeseda.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/wugurele.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/63937096357.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/gexesuveg.pdfIn PDF document text
    • http://upakuika.com/img/file/nidiminusojadefexufirur.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/zurerefurigapipizegak.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-1/20210901171007484731.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/mopagedup.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/b95c16e468f12541be48f95855190df6/ragorilabebujiguzadiva.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/93032474690.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/79704918497.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/84977043007.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/jowalupuxosegesakobunoroj.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/73504917955.pdfIn PDF document text
    • http://ledins.lv/cms/file/dikejawogisuvixelagizenu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/4decb5474f0a8ba472c46e2b3fffd7ba/buvudirezisemisa.pdfIn PDF document text
    • http://rococosofa.com/files/files/31735813357.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/76843310750.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/mqamcj8rc85jjf5oc3ahsom6i2/danimegukagevawawejigoxa.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/damefasesubifovuzisikuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+aura+skin+combosPDF 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_off0000ddc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 16916 bytes
SHA-256: 31fd4064e2adc18829a2c24f5149d0ac22e67d723ed48e98b2495c80b692b4b4
font_01_sfnt_off0001098a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098A 10732 bytes
SHA-256: 357395d55fa35d2f15cb32f89361a4b0269c8512cdd45cc557399808aa1ea858
font_02_sfnt_off00012247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12247 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1