Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a49c9ae2bb9c8d…

MALICIOUS

PDF

78.6 KB Created: 2021-09-01 09:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0687ffe87382cbd51760c663075d5c1c SHA-1: edf1f3c40fd2462943debc4f321d5a760d8da79a SHA-256: b9a49c9ae2bb9c8df02589180a4f83360da8ff3804589917330871f262a39279
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. While no scripts were directly extracted, the nature of the link farm suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lignumweb.com/site/webroot/uploads/files/54960100360.pdf In PDF document text
    • https://limsurempat.com/contents//files/20207723769.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/21549222137.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/tuhs0kof3o5obbc3h1qna6fs27/vupitejemutel.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f3cfa94a717f15705ebf8b421a832c83/zafinupadokepumixef.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d71924a6af3d5d6970fd4910d2915e5d/zinitatejopatiwi.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/rogozo.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/8f5039d4180a69434cae4a363dfc1dae/7755622144.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcb9c3d007---98831068328.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/gasesafajupalariguziv.pdfIn PDF document text
    • http://muszempilla.com/files/file/sodamadixujoxuzabedurasi.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d3967b53012---xodetewobesudotikojeji.pdfIn PDF document text
    • https://isosklo.cz/uploads/44464691092.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/53196716163.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/26074372460.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/vopitojuj.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/sipojalumapif.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/nadanaja.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/zexixowodanoxivulo.pdfIn PDF document text
    • https://yildizwebpaket.com/calisma2/files/uploads/78792690635.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/64749565850.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b276d4c18---lidajovusifirojopomasun.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47350647997.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab773f2c1a2---86606877056.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/35635617074.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b253bf53d9b---viluvubinajisufogaj.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/47993970117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=axis+of+symmetry+and+vertex+finderPDF 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_off0000cd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD07 10732 bytes
SHA-256: f26365aecf64356b67a2dc4f474bf3e1aaa25ef546e526d93e5326c586c93123
font_01_sfnt_off0000e5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C2 17668 bytes
SHA-256: 1d2e7c8d615bc0b6486a64c84b07495b3b3683fa4bc7f2165b72bd59838570ba
font_02_sfnt_off00011403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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