Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58a6dec9111d1ab…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 12:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aa907e018cedab9719b623dfa74111f4 SHA-1: 85f04b9bb0e5adc20144dafd2b75664666cd2723 SHA-256: e58a6dec9111d1ab9c632fc1378e5756552975ed50eea5e14a94333e9352edfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://longchimvac.net/app/webroot/uploads/files/23895592457.pdf In PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/6o652s2i9421iiakgr1qhijksu/fifebirososamexetixiw.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/616604625.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/nagudedowami.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/tawakupaponoze.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/71255970735.pdfIn PDF document text
    • http://www.moyekolodin.com/files/fejetizesuxebagesitu.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd67b993dd---koroxugimebogulunogiwuv.pdfIn PDF document text
    • http://rococosofa.com/files/files/xisapuganalilojakoboveno.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/sos58n3qsjatte5lj4tckpm41v/mipuw.pdfIn PDF document text
    • https://arerp.kr/data/file///14380817269.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/34681335906.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff7bd1d3de---narafidavejomu.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/muzujewexo.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/gapubenotobugiferip.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/sojipafogalalagedefigab.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/57670256441.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/58170120316.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16124f9fd65e50---leposanunidatofadonavaz.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121a6c2c8017---bonebifeguzoparawu.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/5pp9e08sa8uvnh3v6e76l3dpk2/nariremamedisudiwokikepa.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/fizafejitazitibivadu.pdfIn PDF document text
    • http://philboyd.com/71950538676.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/pezulavenutaxoligajenirun.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/narug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=give+and+take+book+summary+pdfPDF 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_off0000cb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB18 17664 bytes
SHA-256: 5a97dbeaef858080544230a301f39ef699d189c2a15d5ed27b2b7ec4846382e0
font_01_sfnt_off0000f86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11086 11164 bytes
SHA-256: 76cf387ca2b5e69fc9c8db9a1c839527426a1d4557764b9dca3be9760ddc8c77