Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c1ae848b338d2c…

MALICIOUS

PDF

91.0 KB Created: 2021-08-08 09:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d09784fda947123597ba565ac9bab30f SHA-1: 74ff525918e12f64dd1691370765c4e20a495319 SHA-256: d8c1ae848b338d2c5daf0d5764df6e6f4fd6e7d514a462a302074291f14c7554
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of multiple links and the nature of the hosting suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://haciogullari.com/depo/sayfaresim/file/nuzedogaxapezawixuluze.pdf In PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-2/20210502235151589042.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea004a26f2---zametezilil.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6033d6226---tefopazuvovewuwewoxoxes.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/xegevevugupozubipikotoka.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/mopetoxabemuvinub.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b728ca2a5c5---pijokixusoweku.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/463bd824274c8eca1d40b07ae9e0bad3/rofip.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e0948ea1f---lumovimawobitubi.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fab33e5a2---bovuk.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202161716247.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/55436024752.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/neposesof.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/pmv6t1dp27ueq6rn24483065hn/20215132371.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b496647288d---47509576394.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/96936904501.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/ad69250e0d1582726c04eb611b499c4a/senezisominasewel.pdfIn PDF document text
    • https://signika.pl/Upload/file/lavamaxujeboxogen.pdfIn PDF document text
    • https://rotherelectric.com/files/vewole.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/kanalagili.pdfIn PDF document text
    • http://jkphotocon.org/data/userfiles/files/vekidabenuzamonevumewu.pdfIn PDF document text
    • http://e-sportis.com/images/upload/kolulul.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075150c08365---93995034645.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/33858220783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=download+game+temple+run+2+mod+apk+versi+terbaruPDF 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_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 17952 bytes
SHA-256: 7d4a4e19173514914d465d0bfb35d02fc321ceff0a84b2155d92972bfae0f9bd
font_01_sfnt_off00012a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A47 11340 bytes
SHA-256: 2689f00532ce8bf868a91bea39ead6a26a9781ab30d7f3f197f0974ff8726395
font_02_sfnt_off000144a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1