Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1c2b83d2fbf52a…

MALICIOUS

PDF

95.5 KB Created: 2021-08-20 11:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 44f74dbc58e874f9c418744bf494bd00 SHA-1: c1c62bafc11e0a31902f7fde3c0995aab2934f3c SHA-256: de1c2b83d2fbf52a6b10f1aadd2a9a127fd184afdd94b5d2ca1604ee5b742334
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The document also features a large number of external URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://huntic.ru/uplcv?utm_term=calendario+romano+catolico+2020 PDF link annotation
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/bugajow.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/35481647505.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaf9202803---85062023816.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/50304119288.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/77948687313.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/fisobegawikevifuzere.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/lvi7jbvg2mrhqvba1el6ds7omm/27057217689.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/xevaxedaduvaxifirejafuna.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160963c79e020d---25158638647.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/89015073810.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/lifuxemo.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d94a1378c7a0390c27e83c8864988b6b/76756730803.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/550cba82f964ada8fce283811210e7e0/75589997380.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name//files/58056755923.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b601affc8---22183624634.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/lesn12u3oq1c45rk27s1isqo57/53192584185.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/zalapirubikopivujedipo.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/zapofexinivotuvudokubu.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/40039427447.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607610c47d9bc---24069878763.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/xagatovalafakabedopek.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/bigobuvepigabizosu.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82aec3ca51---lakigewupavepusiratuguk.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/nelor.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_off00010ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFB 18924 bytes
SHA-256: f69db49ac6145f849a81676cd739221d287cd394f01531a13964cd13bce7afd9
font_01_sfnt_off00013f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001576c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1576C 10636 bytes
SHA-256: dac0f989c73037a24f67d3229c66b5000e577ca90800ddc12f7691b2a01d5906

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