Malicious PDF — malware analysis report

Static analysis result for SHA-256 6458101014ccc0a6…

MALICIOUS

PDF

71.8 KB Created: 2021-09-25 15:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01601b316a76f79cd94f2cb3fe31b90c SHA-1: 805da020ef8d59d1e38b1fda59667df2cc0eac38 SHA-256: 6458101014ccc0a66cd23903fb19177b8aff193fedf182a66f255e47ca2ff306
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to manipulate search engine rankings or lead users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://pgprojekt.pl/Upload/file/23519571439.pdf In PDF document text
    • http://interroadholland.nl/userfiles/file/gunubu.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210915205133_lfh3wi.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/44368774590.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/48292396169.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/4240425340.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/sexijajarujasopa.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/95de53482e462a7bed91062ced828d18/8147814808.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/50975580549.pdfIn PDF document text
    • https://bacsionline.net/userfiles/file/98276553211.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/50550491639.pdfIn PDF document text
    • http://webbolt.fono.hu/data/editorfile/65504627399.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/25530346826.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/85822087252.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/41450559339.pdfIn PDF document text
    • http://klhl.com/userfiles/file/nilakopok.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/16089662799.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/rumipiximibojimezapivo.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/vonezadof.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/60247994664.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/6432843313.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f478f913ac---jijudukokajo.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e3cde4683---10027291007.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/29896192941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=android+tv+box+steam+linkPDF 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_off0000b2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEB 17700 bytes
SHA-256: e9ae183b8e8c288621c3e6d59835b41fa35644f7f799e0360dc8435a47b745ec
font_02_sfnt_off0000f6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F6 10792 bytes
SHA-256: c28008135d2f98780fa963b3db25a0772ad088b6db46d188b2d101b14164a6cd