Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b1156347599013…

MALICIOUS

PDF

79.6 KB Created: 2021-07-21 18:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5cfe1dbaac9a7590a4d09f472351c2a2 SHA-1: ff49574bde4eeb2c16f01d429cad0deb6c2cd452 SHA-256: c3b11563475990137bc70f767ac1e4c92935f28ea1bde561d4ede5fb7e3976fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS upload storage, likely to download further malicious content. No scripts were extracted, but the presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/6262076c20a43a87ec17bd20aefe8735/12831594428.pdf In PDF document text
    • http://eia-edu.com/userfiles/file/70022828704.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/975537ba4c75ecd39ce5826b066b11ed/fetojosasomotaga.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/5019771536.pdfIn PDF document text
    • https://whitesal.com/data/images/file/4151_20210524231539.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079725f387fa---favalelokodinaxow.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/11sttudupboej66e7l41hilt9s/83569913030.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/4329601962.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/39eda038dc9fb6c8ddff7eb8fd77ca99/tizux.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/xememezelo.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/48591348060.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/nozawadeb.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8698ef09a3---xubajajokudema.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160795ee4b58cb---midefofuzifolow.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/9984240194.pdfIn PDF document text
    • https://grancom.by/upload/docs/96614730558.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/jenomavosonororox.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/rutanugelukaje.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/91476933431.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/93693172661.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e25d6dcad---banejaxidisefolagufekit.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/19674502122.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/fukurowaweral.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12f6a8edf2---punixarilabe.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/fb6fe3c5b001a223bd35e76283c0316a/kutega.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/lijonuduwipop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=summary+in+tagalogPDF 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_off0000d028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD028 17948 bytes
SHA-256: 9b5015ae316130ab5222ad89bd03fef6d5efc6250003385b0088e0ecbf3b5a4e
font_01_sfnt_off0000fef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF1 10440 bytes
SHA-256: e0d01d0d16e20a1e23256d545f37a0131800f61ae4d0368340509c0bd38186da
font_02_sfnt_off0001169c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1